Lennox International 10-K 2025-12-31

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

For the fiscal year ended December 31, 2025

OR

For the transition period from _____to ______

Commission File Number 001-15149

LENNOX INTERNATIONAL INC.

(Exact name of Registrant as specified in its charter)

2140 Lake Park Blvd. Richardson, Texas 75080

(Address of principal executive offices, including zip code)

(Registrant’s telephone number, including area code): (972) 497-5000

Securities Registered Pursuant to Section 12(b) of the Act:

Securities Registered Pursuant to Section 12(g) of the Act: None

Indicate by checkmark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes [X] No [ ]

Indicate by checkmark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Exchange Act. Yes [ ] No [X]

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the last 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes [X] No [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report Yes ☒ No ☐

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements. ☒

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes ☐ No x

As of June 30, 2025, the aggregate market value of the common stock held by non-affiliates of the registrant was approximately $18.2 billion

based on the closing price of the registrant’s common stock on the New York Stock Exchange. As of February 3, 2026, there were 34,802,911 shares of the registrant’s common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s 2026 Definitive Proxy Statement to be filed with the Securities and Exchange Commission in connection with the registrant’s 2026 Annual Meeting of Stockholders to be held on May 21, 2026 are incorporated by reference into Part III of this report.

LENNOX INTERNATIONAL INC.

FORM 10-K

For the Fiscal Year Ended December 31, 2025

PART I

References in this Annual Report on Form 10-K to “we,” “our,” “us,” “Lennox,” “LII” or the “Company” refer to Lennox International Inc. and its subsidiaries, unless the context requires otherwise.

The Company

We are a global leader in energy-efficient climate-control solutions. We design, manufacture and market a broad range of products for the heating, ventilation, air conditioning and refrigeration (“HVACR”) markets. We have leveraged our expertise to become an industry leader known for innovation, quality and reliability. Our products and services are sold through multiple distribution channels under various brand names. The Company was founded in 1895, in Marshalltown, Iowa, by Dave Lennox, the owner of a machine repair business for railroads. He designed and patented a riveted steel coal-fired furnace, which led to numerous advancements in heating, cooling and climate control solutions.

Our two business segments, Home Comfort Solutions and Building Climate Solutions, the key products, services and well-known product and brand names within each segment and net sales in 2025 by segment are shown in the table below. Segment financial data for 2025, 2024 and 2023, including financial information about foreign and domestic operations, is included in Note 3 of the Notes to our Consolidated Financial Statements in “Item 8. Financial Statements and Supplementary Data” and is incorporated herein by reference.

Products and Services

Home Comfort Solutions

Heating & Cooling Products. We manufacture and market a broad range of heat pumps, furnaces, air conditioners, packaged heating and cooling systems, equipment and accessories to improve indoor air quality, comfort control products, replacement parts and supplies and related products for both the residential replacement and new construction markets in North America. These products are available in a variety of designs and efficiency levels and at a range of price points, and are intended to provide a complete line of home comfort solutions. We believe that by maintaining a broad product line marketed under multiple brand names, we can address different market segments and penetrate multiple distribution channels.

The “Lennox” business and brands (“Dave Lennox Signature Collection,” “Elite Series,” “Merit Series,” “iComfort,” “ComfortSense” and “Healthy Climate Solutions”) are sold directly to independent installing dealers, making us one of the

largest wholesale distributors of residential heating, ventilation, and air conditioning products in North America. We operate a network of Lennox Stores across the U.S. and Canada. These stores provide an easy access solution for contractors and independent dealers to obtain universal service and replacement parts, supplies, convenience items, tools, Lennox equipment and OEM parts.

The Allied Air Enterprise business and brands (“Armstrong Air,” “AirEase,” “Concord,” “Ducane,” “Allied,” and “MagicPak”) include a full line of heating, ventilation and air conditioning products and are sold through independent wholesale distributors in the U.S. and Canada. The Allied Air Enterprise business also sells a full line of heating, ventilation and cooling equipment through private label brands.

The Advanced Distributor Products (“ADP”) business and brand (“ADP Advanced Distributor Products”) sells evaporator coils, air handlers and unit heaters to independent HVAC wholesale distributors across the U.S. and Canada.

Building Climate Solutions

Heating and Cooling Products. In North America, we manufacture and sell unitary heating and cooling equipment used in light commercial applications, such as low-rise office buildings, restaurants, retail centers, distribution, churches and schools. Our product offerings for these applications include rooftop units ranging from 2 to 30 tons of cooling capacity and split system/air handler combinations, which range from 1.5 to 20 tons of cooling capacity. These products are distributed primarily through commercial contractors and directly to national account customers. We believe the success of our products is attributable to their efficiency, impact to the environment, design flexibility, total cost of ownership, ease of service, and advanced control technology.

National Account Services. National Account Services (“NAS”) provides installation, service and preventive maintenance for commercial HVAC national account customers in the U.S. and Canada.

AES. In October 2023, we completed the acquisition of AES Industries, Inc. and AES Mechanical Service Group, Inc. (collectively, “AES”), which is included in our Building Climate Solutions segment. AES is a company dedicated to service and sustainability in the light commercial markets across North America. AES manufactures curbs, curb adapters, drop box diffusers and also offers HVAC recycling and salvage services, as well as focusing on multi-facility HVAC replacement for expired mechanical assets.

Refrigeration Products. We manufacture and market equipment for the North American commercial refrigeration markets under the Heatcraft Worldwide Refrigeration name. We sell these products to distributors, installing contractors, engineering design firms, original equipment manufacturers and end-users.

Our commercial refrigeration products include condensing units, unit coolers, fluid coolers, air-cooled condensers, air handlers and refrigeration rack systems. These products preserve food and other perishables in supermarkets, convenience stores, restaurants, warehouses and distribution centers. In addition, our products are used to cool a wide variety of industrial processes, including data centers, machine tooling, and other critical cooling applications. We routinely provide application engineering for consulting engineers, contractors, store planners, end customers and others to support the sale of commercial refrigeration products.

In addition, we own a 50% interest in a joint venture in Mexico that produces unit coolers, air-cooled condensers, condensing units, compressors and compressorized racks of the same design and quality as those manufactured by our U.S. business. This joint venture product line is complemented with imports from the U.S., which are sold through the joint venture’s distribution network.

Duro Dyne and Supco

In October 2025, we completed the acquisition of the Duro Dyne Buyer, Inc. (“Duro Dyne”) and Sealed Unit Parts Buyer, Inc. (“Supco”) businesses and brands (“Duro Dyne,” “Dyna-Tite,” “DuroZone,” “Supco,” and “LINEBACKER”). Duro Dyne and Supco manufacture and sell a robust portfolio of HVAC parts and supplies that complement our existing residential and commercial offerings, such as air distribution accessories, switches and controls, and other engineered components and accessories with HVACR applications. Duro Dyne is reported in our Business Climate Solutions segment, and Supco is reported in our Home Comfort Solutions segment.

Joint Ventures

Ariston JV. We own a 49.9% interest in a joint venture with Ariston Group that will manufacture and distribute water heaters through Lennox Stores and our direct-to-dealer network. Ariston is reporting in our Home Comfort Solutions segment.

Samsung JV. We own a 49.9% interest in a joint venture with Samsung that distributes Samsung ductless AC and heat pump products in the U.S. and Canada as well as "Lennox powered by Samsung" branded products through Lennox Stores and direct-to-dealer network. Results are reported in either Home Comfort Solutions or Building Climate Solutions based on product type.

Corporate and Other

Prior to 2024, Corporate and Other included the results of our European operations. We manufactured and sold unitary HVAC products, which ranged from 2 to 70 tons of cooling capacity, and applied systems with up to 200 tons of cooling capacity. Our European products consisted of small package units, rooftop units, chillers, air handlers and fan coils that served medium-rise commercial buildings, shopping malls, other retail and entertainment buildings, institutional applications and other field-engineered applications. We manufactured heating and cooling products in several locations in Europe and marketed these products through both direct and indirect distribution channels. We also manufactured and marketed refrigeration products including condensing units, unit coolers, air-cooled condensers, fluid coolers, compressor racks and industrial process chillers. We had manufacturing locations in Germany, France and Spain.

In the fourth quarter of 2023, we successfully completed the divestiture of our European operations.

Business Strategy

Lennox offers a full spectrum of cooling, heating, indoor air quality and refrigeration products to meet the energy-efficient climate-control needs of residential and commercial customers across North America. We are advancing our market position through a balanced approach that includes organic growth and selective strategic investments. By effectively managing pricing and costs, we are driving margin expansion and profitability. Our success is rooted in a three-phase self-help transformation plan that continues to guide our progress over the coming years.

Differentiated Growth. We are investing in our sales force to expand customer touchpoints, enhancing the overall customer experience through digital innovations and output from our new commercial HVAC factory in Mexico. Additionally, we are focused on improving the fulfillment rate of HVAC equipment and driving higher attachment rates for parts and accessories, delivering a seamless and comprehensive solution that enhances customer satisfaction.

Resilient Profit Margins. We are committed to sustaining resilient margins through pricing excellence, enhanced productivity from higher volumes, material cost reductions, and a favorable mix influenced by regulatory transitions. Together, these initiatives fortify our financial foundation and long-term competitiveness.

Execution Management. We will leverage the Lennox Unified Management System to streamline our operations and set clear priorities. A focused strategy, investments in heat pump growth, and enhancements to our distribution network further exemplify our commitment to consistent management execution.

Marketing and Distribution

We utilize multiple channels of distribution and offer different brands at various price points in order to better penetrate the HVACR markets. Our products and services are sold through a combination of direct sales, distributors and company-owned parts and supplies stores. Dedicated sales forces and manufacturers’ representatives are deployed across our business segments and brands in a manner designed to maximize our ability to service each distribution channel. To optimize enterprise-wide effectiveness, we have active cross-functional and cross-organizational teams coordinating approaches to pricing, product design, distribution and national account customers.

The North American residential heating and cooling market provides an example of the competitive strength of our marketing and distribution strategy. We use three distinct distribution approaches in this market: the company-owned distribution system, the independent distribution system and direct sales to end-users. We distribute our “Lennox” brands in a company-owned process directly to independent dealers that install these heating and cooling products. We distribute our “Armstrong Air,” “Ducane,” “Air-Ease,” “Concord,” “MagicPak,” “ADP Advanced Distributor Products,” “Duro Dyne,” and “Supco” brands through the traditional independent distribution process pursuant to which we sell our products to distributors

who, in turn, sell the products to installing contractors. We also sell our products through our Lennox Stores.

Manufacturing

We operate manufacturing facilities in North America and utilize the best available manufacturing techniques based on the needs of our businesses, including the use of lean manufacturing and principles of Six Sigma, a disciplined, data-driven approach and methodology for improving quality. We use numerous metrics to track and manage annual efficiency improvements. Some facilities are impacted by seasonal production demand, and we manufacture a mix of heating, cooling and refrigeration products in those facilities to balance production and maintain a relatively stable labor force. We may also hire temporary employees to meet changes in demand.

Strategic Sourcing

We partner with various suppliers to procure the raw materials and components used in the manufacturing of our products. We utilize a central strategic sourcing group that consolidates purchases of certain materials, components and indirect items across business segments to maximize our purchasing strength. The goal of the strategic sourcing group is to develop global strategies for a given component group that focuses on developing long-term relationships that provide significant value to our businesses. Our strategic sourcing group is focused on selecting partners that offer a competitive total cost, industry leading quality, and consistent on time delivery. Compressors, motors and controls constitute our most significant component purchases, while steel, aluminum and copper account for the bulk of our raw material purchases. We own a minority equity interest in a joint venture that manufactures compressors for our residential and commercial heating and cooling and refrigeration businesses to help provide the necessary supply to meet customer needs.

Research, Development and Technology

Research and development is a key pillar of our growth strategy. We operate an engineering and technology organization that focuses on new technology invention, product development, product quality improvements and process enhancements, including our development of next-generation control systems as well as heating, cooling and refrigeration products that include some of the most efficient products in their respective categories. We leverage intellectual property and innovative designs across our businesses. We also leverage product development cycle time improvements and product data management systems to commercialize new products to market more rapidly. We use advanced, commercially available computer-aided design, computer-aided manufacturing, computational fluid dynamics and other sophisticated design tools to streamline the design and manufacturing processes. We use complex computer simulations and analyses in the conceptual design phase before functional prototypes are created. We also operate a full line of prototype machine equipment and advanced laboratories certified by applicable industry associations.

Seasonality

Our sales and related segment profit tend to be seasonally higher in the second and third quarters of the year because summer is the peak season for sales of air conditioning equipment and services in the U.S. and Canada. For the same reason, our working capital needs are generally greater in the first and second quarters, and we generally have higher operating cash inflows in the third and fourth quarters.

HVAC markets are driven by seasonal weather patterns. HVAC products and services are sold year round, but the volume and mix of product sales and services change significantly by season. The industry generally ships roughly twice as many units during June as it does in December. Overall, cooling equipment represents a substantial portion of the annual HVAC market. Between the heating season (roughly November through February) and cooling season (roughly May through August) are periods commonly referred to as “shoulder seasons” when the distribution channel transitions its buying patterns from one season to the next. These seasonal fluctuations in mix and volume drive our sales and related segment profit, resulting in somewhat higher sales in the second and third quarters due to the higher volume in the cooling season relative to the heating season.

Patents and Trademarks

We hold numerous patents that relate to the design and use of our products. We consider these patents important, but no single patent is material to the overall conduct of our business. We proactively obtain patents to further our strategic intellectual property objectives. We own or license several trademarks and service marks we consider important in the marketing of our products and services, and we protect our marks through national registrations and common law rights.

Competition

Substantially all markets in which we participate are competitive. The most significant competitive factors we face are product availability, reliability, energy efficiency, product performance, service, and price, with the relative importance of these factors varying among customer applications. The following are some of the companies we view as significant competitors in each of our business segments, with relevant brand names, when different from the company name, shown in parentheses. The marks below may be the registered or unregistered trademarks or trade names of their respective owners.

Home Comfort Solutions

• Heating & Cooling Products - Carrier Global Corporation (Carrier, Bryant, Payne, Tempstar, Comfortmaker, Heil, Arcoaire, KeepRite, Day & Night); Trane Technologies plc (Trane, American Standard, Ameristar, Oxbox, RunTru); Paloma Industries, Inc. (Rheem, Ruud, Weather King, Friedrich, Nortek); The Bosch Group (York, Luxaire, Coleman, Champion); Daikin Industries, Ltd. (Daikin, Goodman, Amana, GMC); and Madison Industries (Maytag, Westinghouse, Frigidaire, Tappan, Philco, Kelvinator, Gibson, Broan, NuTone).

Building Climate Solutions

• Heating & Cooling Products - Carrier Global Corporation (Carrier, ICP Commercial); Trane Technologies plc (Trane); Paloma Industries, Inc. (Rheem, Ruud); CSW Industrials, Inc.; Daikin Industries, Ltd. (Goodman, McQuay); and AAON, Inc.

• Refrigeration Products - Hussmann Corporation; Paloma Industries, Inc. (Rheem Manufacturing Company (Heat Transfer Products Group)); Emerson Electric Co. (Copeland); Carrier Global Corporation (Carrier); GEA Group (Kuba, Searle, Goedhart); Alfa Laval; Guntner GmbH; Kelvion - Profroid (Carrier); Panasonic Corp. (Sanyo); Technotrans; and Deltatherm.

Human Capital Management

Our success, in large part, relies on the character of our people. That character is reflected in our core values of integrity, respect and excellence. Our continued success depends on our ability to attract, motivate, develop and retain employees who embody our core values.

Management strives to maintain the right number of employees with the necessary skills to match the expected demand for the products and services we deliver. As of December 31, 2025, we employed approximately 12,900 people, primarily in the U.S. (approximately 8,500 employees) and Mexico (approximately 3,200 employees). Of these employees, approximately 5,400 were salaried and 7,500 were hourly. The number of hourly workers varies in order to match our labor needs during periods of fluctuating demand.

Approximately 3,400 of our employees, including international locations, are represented by unions. We believe we have good relationships with our employees and with the unions representing them. On November 1, 2021, our Marshalltown, Iowa-based union ratified a five-year labor agreement. We currently do not anticipate any material adverse consequences resulting from negotiations to renew other collective bargaining agreements.

The Compensation & Human Resources Committee of the Board of Directors is tasked with reviewing LII’s human capital management strategy and talent initiatives. The committee also reports to the full Board on these key employee matters.

To succeed in an ever-changing and competitive labor market, we have identified priorities we believe are critical to our success in attracting, motivating, developing, and retaining employees. These include, among other things: (1) providing competitive compensation and benefit programs, (2) providing career development programs, (3) promoting health and safety, and (4) championing an inclusive work environment. Information on our sustainability commitment is available on our website. The information on our website is not a part of, or incorporated by reference into, this Annual Report on Form 10-K.

Compensation and Benefit Programs**.** We are committed to providing our employees with a competitive compensation package that rewards performance and achievement of desired business results. Our compensation package consists of three primary benefits: pay (base pay and incentive programs linked to our short-term and long-term business goals), health and welfare benefits, and retirement contributions. We analyze our compensation and benefits programs annually to remain competitive and make changes as necessary.

Career Development Programs. To help our employees succeed in their roles and grow their careers at Lennox, we provide numerous training and development programs. One example is our “Career Journey” program which provides employees with engaging tools and resources enabling them to reflect on skills and interests, maintain an individual development plan, and explore a variety of potential career paths. Career Journey allows employees to have more meaningful career development

conversations with their manager. In addition to training and development programs, we regularly conduct succession planning reviews and have robust performance review and goal setting processes for all employees. We believe this helps employees meet expectations throughout the year while continuing development of their long-term careers at Lennox.

Employee Health and Safety. As part of our effort to attract and retain a competitive workforce, we are committed to ensuring that every employee returns home safe at the end of each day. Safety is our top priority and our safety programs are designed to identify and reduce risks across our operations.

Inclusion and Belonging. We are committed to an inclusive work environment built on a foundation of respect and value for people of different backgrounds, experiences, and perspectives. Our commitment to inclusion and belonging enables all employees to be creative, feel challenged, and thrive, which ultimately allows us to leverage the unique strengths of our employees to deliver innovative products and solutions for our customers.

Our senior leaders, together with our human resources team, are devoted to promoting the above priorities to remain an employer of choice. We regularly conduct anonymous surveys to seek feedback from our employees on a variety of subjects, including safety, communications, inclusion and belonging, management support to succeed within our company, and career growth.

Despite these efforts, we have experienced, and could continue to experience, higher employee turnover, particularly in our manufacturing and distribution locations. As a result, we have made and continue to make strong efforts to recruit qualified talent to the organization.

Environmental Regulation

Our operations are subject to evolving and often increasingly stringent international, federal, state and local laws and regulations concerning the environment. Environmental laws and regulations affect or could affect our operations. We believe we are in substantial compliance with such existing environmental laws and regulations.

Energy Efficiency. The U.S. Department of Energy has numerous active energy conservation rulemakings that impact residential and commercial heating, air conditioning and refrigeration equipment. We are actively involved in U.S. Department of Energy activities related to energy efficiency. In 2023, we successfully updated our lines of HVAC equipment to comply with the latest energy conservation standards from the U.S. Department of Energy. We are prepared to have compliant products in place in advance of the effective dates of all such regulations enacted by the U.S. Department of Energy.

Refrigerants. The use of hydroflurocarbons (“HFCs”) as refrigerants for air conditioning and refrigeration equipment is common practice in the HVACR industry and is regulated. We believe we have complied with applicable rules and regulations in various countries governing the use of HFCs. We are an active participant in the ongoing international and domestic dialogue on this subject and believe we are well positioned to react in a timely manner to changes in the regulatory landscape.

In 2020, in response to a global agreement to reduce greenhouse gasses, the bipartisan American Innovation and Manufacturing Act gave the U.S. Environmental Protection Agency (“EPA”) authority to regulate HFCs and begin the phase down of refrigerants with a higher global warming potential (“GWP”). Transition to refrigerants with a GWP of 700 or less for most commercial and residential HVAC products became effective January 1, 2025.

Remediation Activity. In addition to affecting our ongoing operations, applicable environmental laws and regulations can impose obligations to remediate hazardous substances at our properties, at properties formerly owned or operated by us and at facilities to which we have sent or send waste for treatment or disposal. We are aware of contamination at some of our facilities; however, based on facts presently known, we do not believe that any future remediation costs at such facilities will be material to our results of operations. For more information, see Note 5 in the Notes to our Consolidated Financial Statements.

In the past, we have received notices that we are a potentially responsible party along with other potentially responsible parties in Superfund proceedings under the Comprehensive Environmental Response, Compensation and Liability Act for cleanup of hazardous substances at certain sites to which the potentially responsible parties are alleged to have sent waste. Based on the facts presently known, we do not believe environmental cleanup costs associated with any Superfund sites about which we have received notice that we are a potentially responsible party will be material to our results of operations.

E-Waste and Related Compliance. Many countries around the world as well as many states in the U.S. have enacted directives, laws, and regulations directed at preventing electrical and electronic equipment waste by encouraging reuse and recycling as well as restricting the use of hazardous products in electrical and electronic equipment. All HVACR products and certain components of such products are potentially subject to these types of requirements. We are not uniquely affected as compared to other manufacturers. We actively monitor the development and evolution of such requirements and believe we are

well positioned to comply with such directives in the required time frames.

Available Information

Our web site address is www.lennox.com. We make available, free of charge through our web site, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, including exhibits, and amendments to those reports filed or furnished pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as soon as reasonably practicable after such material is electronically filed with, or furnished to, the Securities and Exchange Commission. The information on our web site is not a part of, or incorporated by reference into, this Annual Report on Form 10-K.

The Securities and Exchange Commission maintains a website at www.sec.gov that contains reports, proxy and information statements, and other information regarding issuers, including Lennox, that file electronically with the Securities and Exchange Commission.

Information about our Executive Officers

Our executive officers, their present positions and their ages are as follows as of February 3, 2026:

Alok Maskara joined Lennox International Inc. as Chief Executive Officer in May 2022. Most recently he served for five years as CEO of Luxfer Holdings PLC, an international industrial company focused on advanced materials. Mr. Maskara also served for nearly a decade as president of several global business units at Pentair PLC, a leading provider of water treatment and sustainable applications. Previously, he held various leadership positions at General Electric Corporation and McKinsey & Company. Mr. Maskara also serves on the board of Franklin Electric (Nasdaq: FELE) a company focused on global water and fluid solutions. Mr. Maskara graduated with a bachelor of technology degree in chemical engineering from the Indian Institute of Technology in 1992 and a master’s degree in chemical engineering from the University of New Mexico in 1994. In 2000, he earned an MBA from the Kellogg School of Management at Northwestern University.

Michael Quenzer was appointed Executive Vice President and Chief Financial Officer in January 2024*.* He joined Lennox in 2004 and has held key leadership roles including Vice President, Investor Relations and Financial Planning and Analysis and Vice President of Finance for the Lennox Building Climate Solutions (Commercial) business segment. Before joining Lennox, he worked at Morningstar Inc. He holds a bachelor’s degree in finance from Coastal Carolina University and an MBA and master’s degree in accounting from the University of Texas at Dallas.

Prakash Bedapudi was appointed Executive Vice President, Chief Technology Officer in July 2008. He had previously served as Vice President, Global Engineering and Program Management for Trane Inc. Commercial Systems from 2006 through 2008, and as Vice President, Engineering and Technology for Trane’s Residential Systems division from 2003 through 2006. Prior to his career at Trane, Mr. Bedapudi served in senior engineering leadership positions for GE Transportation Systems, a division of General Electric Company, and for Cummins Engine Company. He holds a bachelor of science in mechanical/automotive engineering from Karnataka University, India and a master’s of science in mechanical/aeronautical engineering from the University of Cincinnati.

Monica M. Brown was appointed Executive Vice President, Chief Legal Officer and Secretary in January 2025*.* Previously, she served as LII’s Vice President, Deputy General Counsel, and Assistant Secretary. During her tenure at Lennox, she has been responsible for a broad range of legal functions, including securities, corporate governance, real estate, and the refrigeration and residential businesses. Prior to starting at Lennox in 2012, she practiced commercial litigation at Jones Day, a multinational law firm, for almost 13 years. She received her bachelor’s degree in mathematics from Howard University and has a juris doctor from the University of Texas.

Chris A. Kosel was appointed Vice President, Chief Accounting Officer and Controller in May 2017. He had previously served as Vice President, Business Analysis and Planning for the Company since 2016. He also had served as Vice President, Finance and Controller and Director of Finance for the Company’s North America Commercial Business from 2015 to 2016 and Director, Financial Planning and Analysis for the Company’s Residential Business Unit from 2014 to 2015. Prior to 2014 he had served as Director, Finance for the Company’s Lennox Stores business and Director of the Company’s Financial Shared Services function. Prior to joining Lennox, he worked for Ernst & Young. He holds a bachelor’s degree in accounting from Texas A&M University. He is also a Certified Public Accountant.

Sarah R. Martin was appointed Executive Vice President & President of LII’s Home Comfort Solutions business segment in April 2025. Previously, she served 13 years in various roles at Honeywell International Inc., including as president of Honeywell Sensing & Safety Technologies and Honeywell Advanced Sensing Technologies. Prior to Honeywell, Martin held various commercial and operational leadership roles at CTS Corporation, a global electronics manufacturing service provider. She holds an MBA from the Edinburgh Business School at Heriot Watt University and her master’s of art in modern languages and business from Heriot Watt University.

Joe Nassab has been Executive Vice President & President of our Building Climate Solutions business since May 2022. He joined LII in 2010 as Vice President and General Manager of Allied Air. Before joining LII, Mr. Nassab worked for 20 years at General Electric Company in a variety of general management, product management, and marketing leadership roles. Mr. Nassab has a bachelor’s degree in finance from the University of Michigan.

Daniel M. Sessa was appointed Executive Vice President, Chief Human Resources Officer in June 2007. He had previously served in numerous senior human resources and legal leadership positions for United Technologies Corporation since 1996, including Vice President, Human Resources for Otis Elevator Company - Americas from 2005 to 2007, Director, Employee Benefits and Human Resources Systems for United Technologies Corporation from 2004 to 2005, and Director, Human Resources for Pratt & Whitney from 2002 to 2004. He holds a bachelor of arts in law and society from the State University of New York at Binghamton and a juris doctor from the Hofstra University School of Law.

The following risk factors and other information included in this Annual Report on Form 10-K should be carefully considered. We believe these are the principal material risks currently facing our business; however, additional risks and uncertainties not presently known to us or that we presently deem less significant may also impair our business operations. If any of the following risks or those disclosed in our other Securities and Exchange Commission filings occurs, our business, financial condition or results of operations could be materially adversely affected.

Business and Operational Risks

We May Not be Able to Compete Favorably in the Competitive HVACR Business.

Substantially all of the markets in which we operate are competitive. The most significant competitive factors we face are product availability, product reliability, energy efficiency, product performance, service, and price, with the relative importance of these factors varying among our product lines. Other factors that affect competition in the HVACR market include the development and application of new technologies, reputation of our company and brands, global supply chain constraints, and new product introductions. In some of the markets in which we compete, such as parts and supplies, distribution, and service of commercial heating and cooling equipment, barriers to entry are lower, which has led to highly competitive markets consisting of various-sized entities, ranging from small or local operators to large regional businesses. We may not be able to adapt to market changes as quickly or effectively as our current and future competitors. Also, the establishment of manufacturing operations in low-cost countries could provide cost advantages to existing and emerging competitors. Some of our competitors may have greater financial resources than we have, allowing them to invest in more extensive research and development and/or marketing activity and making them better able to withstand adverse HVACR market conditions. Current and future competitive pressures may cause us to reduce our prices or lose market share, or could negatively affect our cash flow, all of which could have a material adverse effect on our results of operations. Negative media reports about us or our businesses,

whether accurate or inaccurate, could damage our reputation and relationships with our customers and suppliers, cause customers and suppliers to terminate their relationship with us, or impair our ability to effectively compete, which could adversely affect our business, financial condition, results of operations and cash flows.

If We Cannot Successfully Develop and Market New Products or Execute Our Business Strategy, Our Results of Operations Could be Adversely Impacted.

Our future success depends on our continued investment in research and new product development as well as our ability to commercialize new HVACR technological advances in domestic and global markets. The integration of any such new products or technologies into our business may also require the development of new processes and the expenditure of significant financial and operational resources. If we are unable to continue to timely and successfully develop and market new products, achieve technological advances, or extend our business model and technological advances into new markets, our business and results of operations could be adversely impacted.

Lennox operates a direct-to-dealer network, meaning we manufacture products and sell them directly to select, independent home service companies. We rely on our direct sales channel for a substantial portion of our revenue. Our direct-to-dealer network also creates a large installed base of HVACR equipment, and creates opportunities for longer term service, monitoring, solutions, and retrofit revenue. If we are unable to continue to execute our strategy, whether due to changes in economic conditions, a failure to anticipate changing customer needs, entry of new competitors into the low-barrier distribution business, or for any other reason, our revenue could decline, which could in turn adversely impact our product pull-through and our ability to grow revenue.

To remain competitive, we are engaged in various manufacturing rationalization actions designed to achieve our strategic priorities of manufacturing, sourcing, and distribution excellence and of lowering our cost structure. For example, we are continuing to reorganize our North American distribution network in order to better serve our customers’ needs by deploying parts and equipment inventory closer to them. In such case, our results of operations and profitability may be negatively impacted, making us less competitive and potentially causing us to lose market share.

Our Ability to Meet Customer Demand and Maintain Profitability may be Limited by Our Single-Location Production Facilities, Reliance on Certain Key Suppliers, and Unanticipated Significant Shifts in Customer Demand.

We manufacture many of our products at single-location production facilities. In certain instances, we heavily rely on suppliers who also may concentrate production in single locations or source unique, necessary products from only one supplier. As a result, any significant interruptions in production at one or more of our facilities or at a facility of one of our key suppliers, any failure to maintain favorable relationships with our suppliers, or any termination of a key supplier relationship, could negatively impact our profitability and ability to deliver our products to our customers.

Further, even with all of our facilities running at full production, we could potentially be unable to fully meet demand during an unanticipated period of exceptionally high demand. This inability to fully meet demand would be exacerbated if a single-location production facility is disrupted due to external factors including, but not limited to, a climate-related disaster, pandemic or epidemic, geopolitical instability, or war. Our inability to meet our customers’ demand for our products could have a material adverse effect on our business, financial condition, and results of operations. Conversely, reduced demand for our products and services could unfavorably impact our absorption of fixed costs. Any of these results could materially and adversely affect our business, financial condition, results of operations and cash flows.

Our Results of Operations May Suffer if We Cannot Continue to License or Enforce the Intellectual Property Rights on Which Our Businesses Depend or if Third Parties Assert That We Violate Their Intellectual Property Rights.

We rely upon patent, copyright, trademark and trade secret laws and agreements to establish and maintain intellectual property rights in the products we sell. Our intellectual property rights could be challenged, invalidated, infringed, circumvented, or be insufficient to permit us to take advantage of current market trends or to otherwise provide competitive advantages. Further, the laws of certain countries do not protect proprietary rights to the same extent as the laws of the U.S.

Third parties may also claim that we are infringing upon their intellectual property rights. If we do not license infringed intellectual property or if we are required to substitute similar technology from another source, our operations could be adversely affected. Even if we believe that intellectual property claims are without merit, they can be time consuming, require significant resources and be costly to defend. Claims of intellectual property infringement also might require us to redesign affected products, pay costly damage awards, or face injunctions prohibiting us from manufacturing, importing, marketing, or

selling certain of our products. Even if we have agreements to indemnify us, indemnifying parties may be unable or unwilling to do so.

Our Operations Can Be Adversely Affected By Our Ability to Attract, Motivate, Develop, and Retain Our Employees, Labor Shortages and Work Stoppages, Turnover, Labor Cost Increases and Other Labor Relations Problems.

We are committed to attracting, motivating, developing, and retaining our employees to remain an employer of choice. Despite our efforts, we have experienced, and could continue to experience, employee turnover, particularly in our manufacturing and distribution locations. A number of factors may adversely affect the labor force available or increase labor costs, including labor shortages from high employment levels and related competition or labor stoppages due to disputes or strikes. In addition, as of December 31, 2025, approximately 26% of our core workforce locations were unionized. Our Marshalltown, Iowa-based union ratified a five-year labor agreement on November 1, 2021; however, the results of future negotiations with unions are uncertain. If we are unsuccessful in meeting these challenges, our results of operations could be materially impacted.

Artificial Intelligence Technologies Could Present Business, Compliance, and Reputational Risks.

Recent technological advances in artificial intelligence (“AI”) and machine-learning technology both present opportunities and pose risks to us. If we fail to keep pace with rapidly evolving technological developments in AI, our competitive position and business results may suffer. We face risk of competitive disadvantage if our competitors more effectively use AI to better serve customers, drive internal efficiencies, and/or create new or enhanced products or services. We have begun to incorporate AI capabilities into our operations and the introduction of these technologies, particularly generative AI, into internal processes, customer engagements, and/or new and existing product offerings may result in new or expanded risks and liabilities, including due to enhanced governmental or regulatory scrutiny, litigation, compliance issues, ethical concerns, confidentiality or security risks, as well as other factors that could adversely affect our business, reputation, and financial results. In addition, our personnel could, unbeknownst to us, improperly utilize AI and machine learning-technology while carrying out their responsibilities. The use of AI in the development of our products and services could also cause loss of intellectual property, as well as subject us to risks related to intellectual property infringement or misappropriation, data privacy and cybersecurity. The use of AI can lead to unintended consequences, including generating content that appears correct but is factually inaccurate, misleading or otherwise flawed, or that results in unintended biases and discriminatory outcomes, which could harm our reputation and business and expose us to risks related to inaccuracies or errors in the output of such technologies. Finally, multiple jurisdictions have either already put in place laws and regulations governing the use of AI, or are considering such laws and regulations. Compliance with these laws, regulations, and industry frameworks may limit our ability to leverage AI or require us to substantially revise our approach to its use.

Industry Risks

Our Financial Performance Is Affected by the Conditions and Performance of the U.S. Construction Industry.

Our business is affected by the performance of the U.S. construction industry. Our sales in the residential and commercial new construction markets correlate to the number of new homes and buildings that are built, which in turn is influenced by cyclical factors such as interest rates, inflation, availability of financing, consumer spending habits and confidence, employment rates and other macroeconomic factors over which we have no control. Our sales may not improve, or improvement may be limited or lower than expected.

Cooler than Normal Summers and Warmer than Normal Winters May Depress Our Sales.

Demand for our products and services is seasonal and strongly affected by the weather. Cooler than normal summers depress our sales of replacement air conditioning and refrigeration products and services. Similarly, warmer than normal winters have the same effect on our heating products and services. Extreme weather events, conditions, and water scarcity, as a result of climate change or other factors, may exacerbate fluctuations in typical weather patterns, creating financial risks to our business.

Price Volatility for Commodities and Components We Purchase or Significant Supply Interruptions Could Have an Adverse Effect on Our Cash Flow or Results of Operations.

We depend on raw materials, such as steel, copper and aluminum, and components purchased from third parties to manufacture our products. Some of these third-party suppliers are located outside of the U.S. We generally concentrate purchases for a given raw material or component with a small number of suppliers. If a supplier is unable or unwilling to meet

our supply requirements, including suffering any disruptions at its facilities or in its supply chain, we could experience supply interruptions or cost increases, either of which could have an adverse effect on our results of operations. For example, disruptions have occurred due to supplier capacity constraints, labor shortages, port congestion, logistical problems, the COVID-19 pandemic, and other issues. Some of these disruptions have resulted in supply chain constraints affecting our business including our ability to timely produce and ship our products.

Similarly, suppliers of components that we purchase for use in our products may be affected by rising material costs and inflation and pass these increased costs on to us. Although we regularly pre-purchase a portion of our raw materials at fixed prices each year to hedge against price increases, an increase in raw materials prices not covered by our fixed price arrangements could significantly increase our cost of goods sold and negatively impact our margins if we are unable to effectively pass such price increases on to our customers. Alternatively, if we increase our prices in response to increases in the prices or quantities of raw materials or components or if we encounter significant supply interruptions, our competitive position could be adversely affected, which may result in depressed sales and profitability.

Additionally, the effects of extreme weather events and natural disasters, long-term changes in temperature levels, water availability, increased cost for decarbonizing process heating, supply costs impacted by increasing energy costs, or energy costs impacted by carbon prices or offsets, as a result of climate change or other factors, may exacerbate supply chain constraints and disruption. Resulting supply chain constraints have required, and may continue to require, in certain instances, alternative delivery arrangements and increased costs and could have a material adverse effect on our business and operations.

In addition, we use derivatives to hedge price risk associated with forecasted purchases of certain raw materials. Our hedged prices could result in paying higher or lower prices for commodities as compared to the market prices for those commodities when purchased.

We May Incur Substantial Costs as a Result of Product Liability, Warranty Claims, or Recalls.

The development, manufacture, sale, and use of our products involve warranty and product liability claims and other liabilities and risks for the installation, use, and service of our products. Our product liability insurance coverage may not be sufficient to cover claims or damage awards or we may not be able to obtain such insurance on acceptable terms in the future, if at all, or obtain insurance that will provide adequate coverage against potential claims. Product liability claims can be expensive to defend, regardless of the ultimate outcome. A significant unsuccessful product liability defense could have a material adverse effect on our financial condition and results of operations.

In addition, for some of our HVACR products, we provide warranty terms ranging from one to 20 years to customers for certain components such as compressors or heat exchangers. Warranty claims are not covered by our product liability insurance and certain product liability claims may also not be covered by our product liability insurance. For certain limited products, we used to provide lifetime warranties. Warranties of such extended lengths pose a risk to us as actual future costs may exceed our current estimates of those costs. Warranty expense is recorded on the date that revenue is recognized and requires significant assumptions about what costs will be incurred in the future. We may be required to record material adjustments to accruals and expense in the future if actual costs for these warranties are different from our assumptions. Our product warranty liability was $167.2 million as of December 31, 2025.

We maintain strict quality controls and procedures. However, we cannot be certain that these controls and procedures will reveal defects in our products or their component parts or raw materials, which may not become apparent until after the products have been placed in use in the market. Accordingly, there is a risk that products will have defects that could require a product recall or field corrective action, either voluntarily or at the direction of a governmental authority. Product recalls and field corrective actions can be expensive to implement and may damage our reputation, customer relationships and market share.

Further, our business depends on the strong brand reputations we have developed. If a reputation is damaged due to actual, potential, or perceived product and service quality issues, we may face difficulty maintaining our market share and pricing with respect to some of our products, which could reduce our sales and profitability.

Legal, Tax, and Regulatory Risks

Changes in Environmental and Climate-Related Legislation, Government Regulations, or Policies Could Have an Adverse Effect on Our Results of Operations.

The sales, gross margins, and profitability for each of our segments could be directly impacted by changes in legislation, government regulations, or policies (collectively, “LRPs”) relating to global climate change and other environmental initiatives and concerns. These LRPs, implemented under global, national, and sub-national climate objectives or policies, can include changes in environmental and energy efficiency standards and tend to target the global warming potential of refrigerants and hydrofluorocarbons, equipment energy efficiency, and combustion of fossil fuels as a heating source. Many of our products consume energy and use refrigerants and hydroflurocarbons. LRPs that seek to reduce greenhouse gas emissions may require us to make increased capital expenditures to develop or market new products to meet new LRPs. Further, our customers and the markets we serve may impose emissions or other environmental standards through LRPs or consumer preferences that may require additional time, capital investment, or technological advancement. Our inability or delay in developing or marketing products that match customer demand while also meeting applicable LRPs may negatively impact our financial condition and results of operations.

There continues to be a lack of consistent climate legislation and regulations, which creates economic and regulatory uncertainty. Such regulatory uncertainty could adversely impact the demand for energy efficient buildings and could increase costs of compliance. Additionally, the extensive and frequently changing legislation and regulations could impose increased liability for remediation costs and civil or criminal penalties in cases of non-compliance. Because these laws are subject to change, we are unable to predict the future costs resulting from environmental compliance. Likewise, a failure to comply with any current or future sustainability-related reporting requirements, as established by U.S. and international regulators, may result in loss of business, regulatory penalties, litigation, and/or reputational damage. Further, we may face adverse reputational risks due to our products and manufacturing operations consuming energy or using refrigerants and hydroflurocarbons.

Stakeholders are increasingly scrutinizing environmental, social and governance (“ESG”) practices, and stakeholders’ expectations regarding ESG practices are diverse, rapidly changing, and sometimes in conflict. If we are unable to satisfy the evolving ESG-related expectations of certain stakeholders, particularly as it relates to climate change, we may suffer reputational harm, which may cause our stock price to decrease or cause certain investors and financial institutions not to purchase our securities or provide us with capital or credit on favorable terms, which may cause our cost of capital to increase. In addition, our reputation and customer relationships may be damaged as a result of practices that could be associated with ESG, including as it relates to climate-related disclosures. A failure or perceived failure by us in this regard may damage our reputation and adversely affect our results of operations and financial condition.

Changes in Tax Laws and Interpretations Could Adversely Impact our Effective Tax Rates and Financial Results.

We are subject to income taxes in the U.S. as well as certain foreign jurisdictions. Tax laws and regulations are continuously evolving with corporate tax reform, base-erosion efforts, global minimum tax, and increased transparency continuing to be high priorities in many tax jurisdictions in which we operate. We continue to monitor new tax legislation or other developments since significant changes in tax legislation, or in the interpretation of existing legislation, could materially and adversely affect our financial condition and results of operations.

Certain countries in which we have operations have implemented, or are in the process of implementing, legislation or practices inspired by the base erosion and profit shifting project undertaken by the Organization for Economic Co-operation and Development (“OECD”). In December 2021, the OECD issued its guidance on the Global Anti-Base Erosion (“GloBE”) rules with the purpose of ensuring multinational companies pay a minimum level tax on the income generated in each of the jurisdictions where they operate (“Pillar Two”). In December 2022, the European Council attained a consensus on Pillar Two to implement a global minimum corporate tax rate of 15%, and many European Union and G20 countries began incorporating and implementing OECD guidelines in 2024. Our effective tax rate for 2025 incorporates our estimated Pillar Two tax liability. We are continuing to evaluate the potential impact on future periods of the Pillar Two framework, pending legislative adoption by individual countries, as such changes could result in an increase in our effective tax rate.

Further, the increased scrutiny of international tax arrangements and continuous changes to countries’ tax legislation may also affect the policies and decisions of tax authorities with respect to certain income tax and transfer pricing positions taken by the Company in prior or future periods. We are regularly subject to audits by tax authorities, and such audits could result in

changes in our tax reserves for our historic or future tax positions and transfer pricing policies, which could significantly adversely impact our effective tax rates and financial results.

For more information, see Note 12 in the Notes to our Consolidated Financial Statements.

Changes in U.S. Trade Policy, Including the Imposition of Tariffs and the Resulting Consequences, Could Have an Adverse Effect on Our Results of Operations.

The U.S. government has made changes in U.S. trade policy over the past several years. These changes include renegotiating and terminating certain existing bilateral or multi-lateral trade agreements, such as the U.S.-Mexico-Canada Agreement (“USMCA”), and initiating tariffs on certain foreign goods from a variety of countries. In addition, the U.S. presidential administration has imposed increased tariffs on imports from Canada and Mexico for goods not covered by the USMCA. The USMCA is subject to review and renewal in 2026, and there can be no assurance that any newly negotiated terms in the USMCA will not adversely affect our business or operations. These changes in U.S. trade policy have led, and may again lead, to foreign governments enacting responsive trade policies that increase the difficulty or cost of doing international business or trade. As a consequence, the sales, gross margins, and profitability for each of our segments could be directly impacted by changes in tariffs and trade agreements.

We cannot predict the extent to which the U.S. or other countries will impose new or additional quotas, duties, tariffs, taxes, non-tariff barriers, or other similar restrictions upon the import or export of our products in the future, nor can we predict future trade policy or the terms of any renegotiated trade agreements and their impact on our business. The continuing adoption or expansion of trade restrictions, the occurrence of trade tensions, or other governmental actions related to tariffs or trade agreements or trade policies, may negatively affect demand for our products, costs, customers, suppliers, and the U.S. economy, which in turn could have a material adverse effect on our business, results of operations, and financial condition.

Our Reputation, Ability to Do Business, and Results of Operations Could be Impaired By Improper Conduct By Any of Our Employees, Agents, or Business Partners.

We are subject to regulation under a wide variety of U.S. federal and state and non-U.S. laws, regulations and policies (including those related to tariffs and trade barriers, investments, taxation, exchange controls, employment regulations, anti-corruption, anti-bribery, export and import compliance, anti-trust and money laundering). In particular, the U.S. Foreign Corrupt Practices Act and similar anti-bribery laws in other jurisdictions generally prohibit companies and their intermediaries from making improper payments to government officials for the purpose of obtaining or retaining business, and we operate in many parts of the world that have experienced government corruption to some degree. We cannot provide assurance our internal controls will always protect us from, or identify any, improper conduct of our employees, agents and business partners. Any such violation of law or improper actions could subject us to civil or criminal investigations in the U.S. and other jurisdictions, could lead to substantial civil or criminal, monetary and non-monetary penalties and related shareholder lawsuits, could lead to increased costs of compliance, and could damage our reputation, our business and results of operations.

We are Subject to Claims, Lawsuits, and Other Litigation That Could Have an Adverse Effect on Our Results of Operations.

In addition to product liability and warranty claims as described above, we are involved in various claims and lawsuits incidental to our business, including those involving intellectual property infringement, labor relations, alleged exposure to asbestos-containing materials, and environmental matters, some of which claim significant damages. Estimates related to our claims and lawsuits, including estimates for asbestos-related claims and related insurance recoveries, involve numerous uncertainties. Given the inherent uncertainty of litigation and estimates, we cannot be certain that existing claims or litigation or any future adverse legal developments will not have a material adverse impact on our financial condition.

General Risk Factors

Global General Business, Economic and Market Conditions Could Adversely Affect Our Financial Performance and Limit Our Access to the Capital Markets.

Our business may be materially and adversely impacted by changes in U.S. or global economic conditions, including recessions, economic downturns, inflation, deflation, fluctuations in interest rates, consumer spending rates, energy availability and commodity prices, and the effects of governmental initiatives to manage economic conditions. Disruptions in U.S. or global financial and credit markets or increases in the costs of capital may also have an adverse impact on our business. The tightening, unavailability or increased cost of credit adversely affects the ability of our customers to obtain financing for significant purchases and operations, resulting in a decrease in sales of our products and services and may impact the ability of

our customers to make payments to us. Similarly, tightening of available credit may adversely affect our supplier base and increase the potential for one or more of our suppliers to experience financial distress or bankruptcy. Our business may also be adversely affected by future decreases in the general level of economic activity and increases in borrowing costs, which may cause our customers to cancel, decrease or delay their purchases of our products and services.

If financial markets were to deteriorate, or costs of capital were to increase significantly due to a lowering of our credit ratings, prevailing industry conditions, the volatility of the capital markets or other factors, we may be unable to obtain new financing on acceptable terms, or at all. A deterioration in our financial performance could also limit our future ability to access amounts currently available under our Credit Agreement or to issue notes pursuant to our commercial paper program, as more fully described below.

We cannot predict the likelihood, duration, or severity of any future disruption in financial markets or any adverse economic conditions in the U.S. and other countries.

Extraordinary Events Beyond our Control, Including Conflicts, Wars, Natural Disasters, Public Health Crises, Terrorist Acts, or Other Civil or Political Disruptions, Could Negatively Impact our Business, Which May Affect our Financial Condition, Results of Operations or Cash Flows.

External disruptions, including, but not limited to, conflicts, wars, natural disasters (the nature and severity of which may be impacted by climate change), public health crises, terrorist acts, or other civil or political disruptions, may cause significant damage or disruption to our operations, employees, facilities, systems, suppliers, supply chain, distributors, resellers, or customers in the U.S. and internationally for extended periods of time and could also affect demand for our products. The extent to which any extraordinary event impacts us depends on numerous factors and future developments that we are not able to predict, including the duration and scope of the event; governmental, business, and individuals’ actions in response to the event; our ability to maintain sufficient qualified personnel; global supply chain disruptions caused by the event; and the impact on economic activity, including financial market instability.

Our International Operations Subject Us to Risks Related to Foreign Currencies Fluctuations and Other Risks.

We earn revenue, pay expenses, own assets, and incur liabilities in countries using currencies other than the U.S. dollar including the Canadian dollar, the Mexican peso, and the Euro. Our Consolidated Financial Statements are presented in U.S. dollars and we translate revenue, income, expenses, assets, and liabilities into U.S. dollars at exchange rates in effect during or at the end of each reporting period. Therefore, increases or decreases in the value of the U.S. dollar relative to other currencies may affect our net operating revenues, operating income and the value of balance sheet items denominated in foreign currencies. Because of the geographic diversity of our operations, weaknesses in some currencies might be offset by strengths in others over time. However, we cannot assure that fluctuations in foreign currency exchange rates, particularly the strengthening of the U.S. dollar against major currencies, would not materially affect our financial results.

In addition to the currency exchange risks inherent in operating in foreign countries, our international sales and operations are also sensitive to changes in foreign national priorities, including government budgets, as well as to geopolitical and economic instability. Net sales outside of the U.S. comprised approximately 7% of our total net sales in 2025. International transactions may involve increased financial and legal risks due to differing legal systems and customs in foreign countries. The ability to manage these risks could be difficult and may limit our operations and make the manufacture and sale of our products internationally more difficult, which could negatively affect our business and results of operations.

Cyber Attacks and Other Disruptions or Misuse of Information Systems We Rely Upon Could Affect Our Ability to Conduct Our Business Effectively.

Our information systems and those of our business partners are important to our business activities. We also outsource various information systems, including data management, to third-party service providers. Despite our security measures as well as those of our business partners and third-party service providers, the information systems we rely upon may be vulnerable to interruption or damage from cyber attacks, computer viruses, worms or other destructive or disruptive software, process breakdowns, denial of service attacks, malicious social engineering or other malicious activities, or any combination thereof. Further, as AI technologies advance, new and increasingly sophisticated attack methods are emerging, including fraud involving impersonation technologies or other forms of generative AI that enhance the scale, frequency, and effectiveness of cyber threats. Attempts have been made to attack our information systems, but we do not believe that material harm has resulted. While we have implemented controls and taken other preventative actions to strengthen these systems against future attacks, we can give no assurance that these controls and preventative actions will be effective. Any breach of data security

could result in a disruption of our services, improper disclosure of personal data or confidential information, or online fraud or cybertheft, which could harm our reputation, require us to expend resources to remedy such a security breach or defend against further attacks, or subject us to liability under laws that protect personal data, resulting in increased operating costs or loss of revenue.

We May Not be Able to Successfully Integrate and Operate Businesses that We May Acquire nor Realize the Anticipated Benefits of Strategic Relationships We May Form.

From time to time, we may seek to complement or expand our businesses through strategic acquisitions, joint ventures, and strategic relationships. For example, in 2025, we completed the acquisition of Duro Dyne and Supco. The success of this and any other transactions will depend, in part, on our ability to timely identify those relationships, negotiate and close the transactions and then integrate, manage, and operate those businesses profitably. If we are unable to successfully complete these actions, we may not realize the anticipated benefits associated with such transactions, which could adversely affect our business and results of operations.

None.

Risk Management and Strategy

We manage cybersecurity risk through three core teams: cybersecurity engineering, data privacy, and a security operation center. These teams are responsible for overseeing data safety during new system and infrastructure deployments, maintaining appropriate cybersecurity controls, and monitoring, documenting and investigating any anomalies affecting employees, suppliers, and customers. Our IT security controls are designed to align with the NIST (National Institute of Standards and Technology) standards and are tested on an ongoing basis. These controls and procedures include processes that oversee and identify cybersecurity risks associated with third-party service providers that we engage, as described below. For instance, we conduct risk and compliance assessments of third-party service providers that request access to our information assets. To support our internal risk management structure, we use third-party specialists to monitor for emerging threats, conduct vulnerability scans and analysis including simulated hacker attacks, and audit our cybersecurity framework. We also maintain an information security risk insurance policy in the event of a security breach. Our internal audit function also performs independent testing on aspects of the operations of our cybersecurity program and the supporting controls based upon its risk-based internal audit plan and reports the results of these audits in its periodic reports to the Audit Committee.

Leadership receives training on how to respond to ransomware events and participates in breach simulations at least once a year. Additionally, employees throughout the organization support LII’s risk management efforts by participating in mandatory cybersecurity training at least once a year, ongoing awareness campaigns, and quarterly simulated phishing attempts.

To our knowledge, LII’s business strategy, results of operations and financial condition have not been materially affected by risks from cybersecurity threats within the last three years, including as a result of previously identified cybersecurity incidents. However, we cannot provide assurance that they will not be materially affected in the future by such risks or any future material incidents. For more information on our cybersecurity related risks, see Item 1A, “Risk Factors.”

Governance

Our Chief Technology Officer is ultimately responsible for overseeing all cybersecurity management, including the three core teams mentioned above, and reports to the Board of Directors twice a year on our cybersecurity tactical responses and strategic roadmap. The entire Board of Directors reviews significant cybersecurity risks and works with the Audit Committee to address enterprise risk management processes and policies.

At the management level, our Data Protection & Cybersecurity Steering Committee (“DPCSC”) meets on a quarterly basis. The DPCSC includes representatives from communications, ethics and compliance, human resources, information technology, corporate audit, legal, risk, privacy, and sourcing. This committee is responsible for overseeing LII’s data protection and cybersecurity policies and procedures. These cybersecurity policies and procedures include an IT security and privacy incident response plan to notify the appropriate parties, including our Chief Technology Officer, our Disclosure Committee, and our Board of Directors, in a timely manner.

Our Chief Technology Officer has served in the role since 2008, and has more than 15 years of experience in developing and executing large enterprise data privacy and cyber security roadmaps at publicly-traded companies. He holds undergraduate and graduate degrees in engineering. Our Vice President, Information Technology, has served in the role since 2003, and has more than 35 years of cybersecurity experience. He holds an undergraduate degree in computer science.

The following chart lists our principal domestic and international manufacturing, distribution and office facilities as of December 31, 2025 and indicates the business segment that uses such facilities, the approximate size of such facilities and whether such facilities are owned or leased. Also included in the chart are large warehouses that hold significant inventory balances.

In addition to the properties described above, we lease numerous facilities in the U.S. and worldwide for use as sales offices, service offices, district and regional warehouses, and Lennox Stores. We routinely evaluate our facilities to ensure adequate capacity, effective cost structure, and consistency with our business strategy. We believe that our properties are in good condition, suitable and adequate for their present requirements and that our principal manufacturing plants are generally adequate to meet our production needs.

We are involved in a number of claims and lawsuits incident to the operation of our businesses. Insurance coverages are maintained and estimated costs are recorded for such claims and lawsuits. It is management’s opinion that none of these claims or lawsuits will have a material adverse effect, individually or in the aggregate, on our financial position, results of operations or cash flows. For more information, see Note 5 in the Notes to the Consolidated Financial Statements.

Not applicable.

PART II

Market Information for Common Stock

Our common stock is listed for trading on the New York Stock Exchange under the symbol “LII.”

Holders of Common Stock

As of the close of business on February 3, 2026, approximately 459 holders of record held our common stock.

Comparison of Total Stockholder Return

The following graph compares the cumulative total returns of LII’s common stock with the cumulative total returns of the Standard & Poor’s 500 Index, a broad index of large U.S. companies of which the Company is a part, and with a revised peer group of U.S. industrial manufacturing and service companies in the HVACR businesses. The graph assumes that $100 was invested on December 31, 2020, with dividends reinvested. Our revised peer group includes AAON, Inc., Carrier Global Corp., CSW Industrials, Inc., Trane Technologies plc, and Watsco, Inc. (“New Peer Group”). AAON, Inc., Carrier Global Corp., Johnson Controls International plc, Trane Technologies plc, and Watsco, Inc. represent our previous peer group (“Old Peer Group”). The change from the Old Peer Group to the New Peer Group is being made to better reflect companies relevant to our current business.

This performance graph and other information furnished under this Comparison of Total Stockholder Return section shall not be deemed to be “soliciting material” or to be “filed” with the Securities and Exchange Commission or subject to Regulation 14A or 14C, or to the liabilities of Section 18 of the Exchange Act.

Our Purchases of Company Equity Securities

Since the inception of our share repurchase program in 2008, our Board of Directors has authorized a total of $5 billion to repurchase shares of our common stock (collectively referred to as the “Share Repurchase Plans”), including an incremental $1.0 billion share repurchase authorization in May 2025. The Share Repurchase Plans permit shares to be repurchased in a variety of methods, including open market purchases, accelerated share repurchases, or other privately negotiated transactions. As of December 31, 2025, $1,009.6 million is available to repurchase shares under the Share Repurchase Plans.

In the fourth quarter of 2025, we purchased shares of our common stock as follows:

(1) Since the inception of the Share Repurchase Plans in 2008, the Board has authorized share repurchases in an amount not to exceed $5.0 billion. The Share Repurchase Plans do not have an expiration date. See Note 6 in the Notes to the Consolidated Financial Statements for further details.

The following discussion should be read in conjunction with the other sections of this report, including the Consolidated Financial Statements and related Notes to the Consolidated Financial Statements in Item 8, “Other Financial Statement Details,” of this Annual Report on Form 10-K.

Forward-Looking Statements

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Exchange Act that are based on information currently available to management as well as management’s assumptions and beliefs as of the date hereof. All statements, other than statements of historical fact, included in this Annual Report on Form 10-K constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements can be identified by the words “may,” “will,” “should,” “plan,” “predict,” “anticipate,” “believe,” “intend,” “estimate” and “expect” and similar expressions. Statements that are not historical should also be considered forward-looking statements. Such statements reflect our current views with respect to future events. Readers are cautioned not to place undue reliance on these forward-looking statements. We believe these statements are based on reasonable assumptions; however, such statements are inherently subject to risks and uncertainties, including but not limited to the specific uncertainties discussed elsewhere in this Annual Report on Form 10-K and the risk factors set forth in Item 1A. Risk Factors in this Annual Report on Form 10-K. These risks and uncertainties may affect our performance and results of operations. Should one or more of these risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may differ materially from those in the forward-looking statements. We disclaim any intention or obligation to update or review any forward-looking statements or information, whether as a result of new information, future events or otherwise unless required by law.

The following are some of the factors that could cause actual results to differ materially from those expressed or implied in forward-looking statements:

• competition in the HVACR business;

• our ability to successfully develop and market new products or execute our business strategy, including the implementation of price increases for products and services;

• our ability to meet and anticipate customer demands;

• our ability to continue to license or enforce our intellectual property rights;

• our ability to attract, motivate, develop and retain our employees, as well as labor relations problems;

• artificial intelligence technologies;

• a decline in new construction activity and related demand for our products and services;

• the impact of weather on our business;

• the impact of higher raw material prices and significant supply interruptions;

• product liability, warranty claims, or recalls;

• changes in environmental and climate-related legislation or government regulations or policies;

• changes in tax legislation;

• the impact of new or increased trade tariffs;

• improper conduct by any of our employees, agents, or business partners;

• litigation risks;

• general economic conditions in the U.S. and abroad;

• extraordinary events beyond our control, such as conflicts, wars, natural disasters, public health crises, terrorist acts, or other civil or political disruptions;

• risks associated with our international operations;

• cyber attacks and other disruptions or misuse of information systems; and

• our ability to successfully realize, complete and integrate acquisitions.

Business Overview

We operate in two reportable business segments of the HVACR industry, Home Comfort Solutions and Building Climate Solutions. In addition to the two major business segments, Corporate and Other is also reported as a segment. For more detailed information regarding our reportable segments, see Note 3 in the Notes to the Consolidated Financial Statements.

In the fourth quarter of 2023, we completed the sale of our European businesses. The European businesses were presented with the Corporate and Other business segment until their divestiture.

In October 2025, we completed the acquisition of Duro Dyne and Supco, a robust portfolio of HVAC parts and supplies that complement our existing residential and commercial offerings. Duro Dyne is reported in our Business Climate Solutions segment, and Supco is reported in our Home Comfort Solutions segment.

In October 2023, we completed the acquisition of AES, which is included in our Building Climate Solutions segment. AES is a company dedicated to service and sustainability in the light commercial markets across North America.

We sell our products and services through a combination of direct sales, distributors and company-owned stores. The demand for our products and services is seasonal and can be significantly impacted by the weather. Warmer than normal summer temperatures generate demand for replacement air conditioning and refrigeration products and services, and colder than normal winter temperatures have a similar effect on heating products and services. Conversely, cooler than normal summers and warmer than normal winters depress the demand for HVACR products and services. In addition to weather, demand for our products and services is influenced by national and regional economic and demographic factors, such as interest rates, the availability of financing, regional population and employment trends, new construction, general economic conditions and consumer spending habits and confidence. A substantial portion of the sales in each of our business segments is attributable to replacement business, with the balance comprised of new construction business.

The principal elements of cost of goods sold are components, raw materials, factory overhead, labor, estimated costs of warranty expense and freight and distribution costs. The principal raw materials used in our manufacturing processes are steel, aluminum and copper. In recent years, pricing volatility for these commodities and related components has impacted us and the HVACR industry in general. We seek to mitigate the impact of certain commodity price volatility through a combination of pricing actions, vendor contracts, improved production efficiency and cost reduction initiatives. We also partially mitigate volatility in the prices of these commodities by entering into futures contracts and fixed forward contracts.

In the fourth quarter of 2025, we changed the method of accounting for our inventories from last-in-first-out (“LIFO”) to first-in-first-out (“FIFO”). We believe the FIFO method is preferable because it more closely matches the physical flow of materials through purchasing, receiving, warehousing, production and order fulfillment, it results in a more consistent method to value inventory across the Company, and it improves comparability with industry peers. This change increased Retained Earnings by $106.6 million as of January 1, 2023, and increased net income by $1.1 million and $4.2 million for the years ended December 31, 2023 and 2024, respectively. All prior amounts have been adjusted.

Financial Highlights

• Net sales decreased $146 million, or 3%, to $5,195 million in 2025 from $5,341 million in 2024.

• Operating income in 2025 was $1,042 million compared to $1,040 million in 2024.

• Net income in 2025 decreased to $806 million from $811 million in 2024.

• Diluted earnings per share was $22.79 per share in 2025 compared to $22.66 per share in 2024.

• We generated $758 million of cash flow from operating activities in 2025 compared to $946 million in 2024.

• We returned $173 million to shareholders through dividend payments and repurchased $482 million as part of our Share Repurchase Plans in 2025.

Recent Developments

On July 4, 2025, the One Big Beautiful Bill Act (the “OBBBA”) was enacted into law, introducing significant changes to corporate income tax rates and deductions. For fiscal year 2025, the OBBBA did not have a material impact on our effective tax rate. We continue to evaluate the future impact of the OBBBA for those provisions that are effective after fiscal year 2025.

Overview of Results

The Home Comfort Solutions segment experienced a 7% decrease in net sales and a $32 million decrease in segment profit in 2025 as compared to 2024 primarily driven by lower sales volumes. Our Building Climate Solutions segment saw an increase in net sales of 5% and a $33 million increase in segment profit in 2025 compared to 2024, primarily due to favorable price and mix.

Results of Operations

The following table provides a summary of our financial results, including information presented as a percentage of net sales (dollars in millions):

Year Ended December 31, 2025 Compared to Year Ended December 31, 2024 - Consolidated Results

Net Sales

Net sales decreased 3% in 2025 compared to 2024 as lower sales volumes of 13% were partially offset by favorable price and mix of 9% and a 1% increase in sales volumes due to our fourth quarter acquisition of Duro Dyne and Supco.

Gross Profit

Gross profit margins for 2025 increased 10 basis points (“bps”) to 33.4% compared to 33.3% in 2024. Gross profit margin increased 290 bps from higher price and favorable mix, which was partially offset by 160 bps from higher products costs and 120 bps from higher freight and distribution costs.

Selling, General and Administrative Expenses

SG&A expenses decreased by $49 million in 2025 compared to 2024. As a percentage of net sales, SG&A expenses decreased 60 bps from 13.7% to 13.1% in the same periods, primarily due to lower employee-related costs including reduced incentive compensation and reduced discretionary expenses.

Losses and Other Expenses, Net

Losses and other expenses, net for 2025 and 2024 included the following (in millions):

Foreign currency exchange gains increased in 2025 primarily due to changes in foreign exchange rates in our primary markets. Acquisition costs are related to the acquisition of Duro Dyne and Supco. The acquisition occurred in the fourth quarter

of 2025. The Environmental liabilities and special litigation charges in 2025 relate to estimated remediation costs at some of our facilities and outstanding legal settlements including asbestos. Refer to Note 5 in the Notes to the Consolidated Financial Statements for more information on litigation, including asbestos-related litigation, and environmental liabilities.

Restructuring Charges

There were $6.8 million in restructuring charges in 2025 to realize SG&A and distribution efficiencies. There were no charges in 2024. For more information on our restructuring activities, see Note 7 in the Notes to the Consolidated Financial Statements.

Goodwill

We performed a qualitative impairment analysis and noted no indicators of goodwill impairment for the year ended December 31, 2025. Refer to Note 9 in the Notes to the Consolidated Financial Statements for more information on goodwill.

Income from Equity Method Investments

Investments over which we do not exercise control but have significant influence are accounted for using the equity method of accounting. Income from equity method investments was $6 million in 2025 as compared to $8 million in 2024.

Interest Expense, net

Net interest expense of $41 million in 2025 increased slightly from $39 million in 2024 primarily due to increased borrowings as a result of decreased cash flow.

Income Taxes

The income tax provision was $191 million in 2025 compared to $188 million in 2024, and the effective tax rate was 19.2% in 2025 compared to 18.8% in 2024. The 2025 and 2024 effective tax rates differ from the statutory rate of 21% primarily due to foreign taxes. Refer to Note 12 in the Notes to the Consolidated Financial Statements for more information on income taxes.

Year Ended December 31, 2025 Compared to Year Ended December 31, 2024 - Results by Segment

Home Comfort Solutions

The following table presents our Home Comfort Solutions segment’s net sales and profit for 2025 and 2024 (dollars in millions):

Net sales decreased 7% in 2025 compared to 2024 as a 17% decrease in sales volumes was partially offset by a 10% increase in price and mix.

Segment profit in 2025 decreased $32 million compared to 2024 primarily due to $224 million reduction in sales volumes, $64 million increase in product costs and factory inefficiencies, and $47 million in higher freight and distribution costs. Partially offsetting these decreases was $256 million in favorable price and mix and $47 million from improvement in other costs, including selling expenses.

Building Climate Solutions

The following table presents our Building Climate Solutions segment’s net sales and profit for 2025 and 2024 (dollars in millions):

Net sales increased 5% in 2025 compared to 2024 due to an 8% increase in favorable price and mix and a 2% increase in sales volumes from our Duro Dyne acquisition, which were partially offset by a 5% decrease in sales volumes.

Segment profit in 2025 increased $33 million compared to 2024 due to $100 million from price and mix benefit. Partially offsetting this increase was $31 million in lower sales volumes, a $16 million increase in product costs, net of factory efficiencies, and $20 million from inflation in distribution and selling as well as other discretionary spend.

Corporate and Other

The following table presents our Corporate and Other segment’s net sales and loss for 2025 and 2024 (dollars in millions):

Corporate and Other costs decreased $15 million in 2025 as compared to 2024, primarily due to lower employee costs, including reduced incentive compensation, as well as improved productivity in consultant spending.

Year Ended December 31, 2024 Compared to Year Ended December 31, 2023 - Consolidated Results

Net Sales

Net sales increased 7% in 2024 compared to 2023 as higher sales volumes of 8%, favorable price and mix of 3% and an increase of sales volumes of 1% from our AES acquisition were partially offset by a 5% reduction in sales due to the fourth quarter 2023 sale of our European businesses.

Gross Profit

Gross profit margins for 2024 increased 220 bps to 33.3% compared to 31.1% in 2023. Gross profit margin increased 250 bps from higher price and favorable mix, which was partially offset by 30 bps from higher freight and distribution costs and product costs.

Selling, General and Administrative Expenses

SG&A expenses increased by $25 million in 2024 compared to 2023. As a percentage of net sales, SG&A expenses decreased 50 bps from 14.2% to 13.7% in the same periods, primarily due to higher employee-related costs including increased incentive compensation, which was partially offset by a $62 million reduction in SG&A expenses from our 2023 divestiture of our European businesses.

Losses and Other Expenses, Net

Losses and other expenses, net for 2024 and 2023 included the following (in millions):

The net change in unrealized (gains) losses on unsettled futures contracts was due to changes in commodity prices relative to the unsettled futures contract prices. For more information on our derivatives, see Note 9 in the Notes to the Consolidated Financial Statements. Foreign currency exchange losses increased in 2024 primarily due to changes in foreign exchange rates in our primary markets. Environmental liabilities and special litigation charges in 2024 relate to estimated remediation costs at some of our facilities and outstanding legal settlements including asbestos. Refer to Note 5 in the Notes to the Consolidated Financial Statements for more information on litigation, including asbestos-related litigation, and environmental liabilities.

Restructuring Charges

There were no restructuring charges in 2024 compared to $3.1 million in 2023. Charges in 2023 were related to the reorganization or removal of duplicative headcount and infrastructure. For more information on our restructuring activities, see Note 7 in the Notes to the Consolidated Financial Statements.

Goodwill

We performed a qualitative impairment analysis and noted no indicators of goodwill impairment for the year ended December 31, 2024. Refer to Note 9 in the Notes to the Consolidated Financial Statements for more information on goodwill. In 2023, we recorded a $2.3 million impairment of goodwill related to our agreement to sell our European commercial HVAC and refrigeration businesses.

Asset Impairments

We did not have any impairments of assets in 2024. In the third quarter of 2023, we recorded a $22.6 million impairment of property, plant and equipment related to our agreement to sell our European commercial HVAC and refrigeration businesses.

Income from Equity Method Investments

Investments over which we do not exercise control but have significant influence are accounted for using the equity method of accounting. Income from equity method investments was $8 million in 2024 consistent with 2023.

Interest Expense, net

Net interest expense of $39 million in 2024 decreased from $52 million in 2023 primarily due to decreased borrowings as a result of increased cash flow.

Income Taxes

The income tax provision was $188 million in 2024 compared to $148 million in 2023, and the effective tax rate was 18.8% in 2024 compared to 20.0% in 2023. The 2024 and 2023 effective tax rates differ from the statutory rate of 21% primarily due to foreign taxes. Refer to Note 12 in the Notes to the Consolidated Financial Statements for more information on income taxes.

Year Ended December 31, 2024 Compared to Year Ended December 31, 2023 - Results by Segment

Home Comfort Solutions

The following table presents our Home Comfort Solutions segment’s net sales and profit for 2024 and 2023 (dollars in millions):

Net sales increased 11% in 2024 compared to 2023 due to a 7% increase in volume and a 4% increase in price and mix.

Segment profit in 2024 increased $149 million compared to 2023 primarily due to $122 million from higher price and favorable mix, $90 million from higher sales volumes and $9 million from factory productivity and favorable product costs. Partially offsetting these increases were $37 million from higher SG&A costs, $20 million from higher freight and distribution costs, $9 million from unfavorable foreign currency, and $6 million from miscellaneous other items.

Building Climate Solutions

The following table presents our Building Climate Solutions segment’s net sales and profit for 2024 and 2023 (dollars in millions):

Net sales increased 17% in 2024 compared to 2023 primarily due to a 9% increase in sales volumes, a 3% increase in higher price and favorable mix, and a 5% increase in sales volumes from our AES acquisition.

Segment profit in 2024 increased $61 million compared to 2023 primarily due to $44 million from higher sales volumes, $39 million from price and mix benefit, and $15 million from our AES acquisition. Partially offsetting these increases were $28 million in expenses from higher factory inefficiencies, which includes costs related to the ramp up of our new facility in Mexico, slightly higher product costs, and $9 million of inflationary wage impacts.

Corporate and Other

The following table presents our Corporate and Other segment’s net sales and loss for 2024 and 2023 (dollars in millions):

Net sales decreased $248 million and segment loss increased $26 million in 2024 as compared to 2023. Our European businesses, which were sold in 2023, generated net sales of $248 million and a profit of $7 million in 2023. Excluding our European business, Corporate and Other costs increased $19 million in 2024 as compared to 2023 primarily due to higher incentive compensation and other employee costs and wage inflation.

Accounting for Futures Contracts

Realized gains and losses on settled futures contracts are a component of segment profit (loss). Unrealized gains and losses on unsettled futures contracts are excluded from segment profit (loss) as they are subject to changes in fair value until their settlement date. Both realized and unrealized gains and losses on futures contracts are a component of Losses (gains) and other expenses, net in the accompanying Consolidated Statements of Operations. See Note 9 of the Notes to Consolidated Financial Statements for more information on our derivatives and Note 3 of the Notes to the Consolidated Financial Statements for more information on our segments and for a reconciliation of segment profit to operating income.

Liquidity and Capital Resources

Our working capital and capital expenditure requirements are generally met through internally generated funds, bank lines of credit and our commercial paper program. Working capital needs are generally greater in the first and second quarters due to the seasonal nature of our business cycle.

Statement of Cash Flows

The following table summarizes our cash flow activity for the years ended December 31, 2025, 2024 and 2023 (in millions):

Net Cash Provided By Operating Activities - Net cash provided by operating activities decreased $188 million to $758 million in 2025 compared to $946 million in 2024. The decrease was primarily attributable to an increase in net working capital of $217 million.

Net Cash Used In Investing Activities - Net cash used in investing activities increased $481 million from 2024 to 2025 primarily due to $545 million related to our acquisition of Duro Dyne and Supco, which was partially offset by lower capital expenditures. Capital expenditures were $119 million, $164 million and $250 million in 2025, 2024 and 2023, respectively. Capital expenditures in 2025 were primarily related to the expansion of our manufacturing capacity equipment and investments in systems and software to support the overall enterprise.

Net Cash Used In Financing Activities - Net cash used in financing activities was $466 million in 2025 and $419 million in 2024. The increase was primarily due to share repurchases in 2025, offset by higher net debt borrowings. We repurchased $482 million and $54 million in 2025 and 2024, respectively, as part of our Share Repurchase Plans. There were no repurchases in 2023. We also returned $173 million to shareholders through dividend payments in 2025.

Debt Position

The following table details our lines of credit and financing arrangements as of December 31, 2025 (in millions):

Commercial Paper Program

On October 25, 2023, we established a commercial paper program (the “Program”), as a replacement to our Asset Securitization Program which expired in November 2023, pursuant to which we may issue short-term, unsecured commercial paper notes (the “CP Notes”) under the exemption from registration contained in Section 4(a)(2) of the Securities Act. Amounts available under the Program may be borrowed, repaid, and re-borrowed from time to time, with the aggregate face or principal amount of the CP Notes outstanding under the Program at any time not to exceed $500.0 million. The CP Notes have maturities of up to 397 days from the date of issue and rank pari passu with all of our other unsecured and unsubordinated indebtedness. The net proceeds from issuances of the CP Notes are typically used for general corporate purposes. Our revolving credit facility serves as a liquidity backstop for the repayment of CP Notes outstanding under the Program. There are $226.0 million in CP Notes outstanding under the Program as of December 31, 2025.

Credit Agreement

On May 9, 2025, we entered into an Amendment and Restatement Agreement (the “Credit Agreement”) to our existing unsecured revolving credit facility with JPMorgan Chase Bank, N.A., as administrative agent, and the other lenders party thereto. Our Credit Agreement consists of a $1.0 billion unsecured revolving credit facility with an option to increase the revolving commitments by up to $350 million at our request, subject to the terms and conditions of the Credit Agreement. We had no outstanding borrowings as well as $1.7 million committed to standby letters of credit as of December 31, 2025. Subject to covenant limitations, $772.3 million was available for future borrowings after taking into consideration outstanding borrowings under the Program. The Credit Agreement includes a subfacility for swingline loans of up to $65.0 million. The Credit Agreement will expire and outstanding loans will be required to be repaid in May 2030, unless maturity is extended by the lenders pursuant to two one-year extension options that we may request under the Credit Agreement.

Term Loan

On October 16, 2025, we entered into a Term Credit Agreement (the “Term Credit Agreement”) with Wells Fargo Bank, National Association, as administrative agent, and the other lenders party thereto. We borrowed $300.0 million pursuant to the Term Credit Agreement and used the net proceeds to repay existing borrowings under the Credit Agreement. The Term Credit Agreement matures on October 16, 2027. Loans under the Term Credit Agreement bear interest at our election at a rate per annum equal to (i) a forward-looking term rate based on the secured overnight financing rate for the applicable interest period ("Term SOFR"), plus an applicable margin ranging between 0.90% and 1.025% per annum depending on our long-term unsecured debt rating, or (ii) the highest of the Wells Fargo Bank, National Association prime rate, the Federal Funds rate plus

0.50%, and Term SOFR for a one month tenor in effect on such day plus 1.00%, plus an applicable margin ranging between 0.00% and 0.025% per annum depending on our long-term unsecured debt rating.

The Term Credit Agreement contains customary covenants and events of default that are substantially similar to the existing covenants and events of default in our Credit Agreement.

Senior Unsecured Notes

In September 2023, we issued $500.0 million of senior unsecured notes, which will mature in September 2028 (the "2028 Notes") with interest being paid semi-annually in March and September at 5.50%. In July 2020, we issued senior unsecured notes for $300.0 million, which will mature on August 1, 2027 (the "2027 Notes" and collectively with the 2028 Notes, the "Notes") with interest being paid semi-annually in February and August at 1.70% per annum. On August 1, 2025, we repaid upon maturity $300.0 million of our 1.35% senior unsecured notes due in 2025 that were originally issued in 2020.

Financial Leverage

We periodically review our capital structure, including our primary bank facility, to ensure the appropriate levels of liquidity and leverage and to take advantage of favorable interest rate environments or other market conditions. We consider various other financing alternatives and may, from time to time, access the capital markets.

We also evaluate our debt-to-capital and debt-to-EBITDA ratios to determine, among other considerations, the appropriate targets for capital expenditures and share repurchases under our Share Repurchase Plans. Our book value of debt-to-total-capital ratio decreased to 54% at December 31, 2025 compared to 57% at December 31, 2024.

As of December 31, 2025, our senior credit ratings were Baa1 with a stable outlook, and BBB with a stable outlook, by Moody’s Investors Service, Inc. (“Moody’s”) and Standard & Poor’s Rating Group (“S&P”), respectively. The security ratings are not a recommendation to buy, sell or hold securities and may be subject to revision or withdrawal at any time by the assigning rating agency. Each rating should be evaluated independently of any other rating. Our goal is to maintain investment grade ratings from Moody’s and S&P to help ensure the capital markets remain available to us.

Liquidity

We believe our cash and cash equivalents of $34.2 million, future cash generated from operations and available future borrowings are sufficient to fund our operations, planned capital expenditures, future contractual obligations, share repurchases, anticipated dividends and other needs in the foreseeable future. Included in our cash and cash equivalents as of December 31, 2025 was $9 million of cash held in foreign locations, although that amount can fluctuate significantly depending on the timing of cash receipts and payments. Our cash and cash equivalents held in foreign locations is generally available for use in our U.S. operations and could be subject to foreign withholding taxes and U.S. state taxes.

No contributions are required to be made to our U.S. defined benefit plans in 2026. We made $7.6 million in total contributions to our pension plans in 2025.

Dividend payments were $173 million in 2025 compared to $160 million in 2024. On May 22, 2025, our Board of Directors approved a 13% increase in our quarterly dividend on common stock from $1.15 to $1.30 per share effective with the July 2025 dividend payment.

Delaware law limits the ability to pay dividends to surplus or, if there is no surplus, out of net profits for the fiscal year in which the dividend is declared and/or the preceding fiscal year. In addition, stock repurchases can only be made out of surplus and only if our capital would not be impaired.

We expect capital expenditures of approximately $250 million in 2026 for general capital improvement projects.

Financial Covenants related to our Debt

The Credit Agreement and Term Credit Agreement (the “Credit Facilities”) are guaranteed by the Guarantor Subsidiaries (as defined below) and contain customary covenants applicable to us and our subsidiaries including limitations on indebtedness, liens, dividends, stock repurchases, mergers and sales of all or substantially all of our assets. In addition, the Credit Facilities each contain a financial covenant requiring us to maintain, as of the last day of each fiscal quarter for the four prior fiscal

quarters, a Total Net Leverage Ratio of no more than 3.50 to 1.00 (or, at our election, on up to two occasions following a material acquisition, 4.00 to 1.00).

Our Credit Facilities contains customary events of default. These events of default include nonpayment of principal or other amounts, material inaccuracy of representations and warranties, breach of covenants, default on certain other indebtedness or receivables securitizations (cross default), certain voluntary and involuntary bankruptcy events and the occurrence of a change in control. A cross default under our Credit Facilities could occur if:

• We fail to pay any principal or interest when due on any other indebtedness or receivables securitization exceeding $75.0 million; or

• We are in default in the performance of, or compliance with any term of any other indebtedness in an aggregate principal amount exceeding $75.0 million, or any other condition exists which would give the holders the right to declare such indebtedness due and payable prior to its stated maturity.

Each of our major debt agreements contains provisions by which a default under one agreement causes a default in the others (a cross default). If a cross default under our Credit Facilities or our senior unsecured notes were to occur, it could have a wider impact on our liquidity than might otherwise occur from a default of a single debt instrument or lease commitment.

If any event of default occurs and is continuing, the administrative agent, or lenders with a majority of the aggregate commitments, may require the administrative agent to terminate our right to borrow under our Credit Agreement and accelerate amounts due under our Credit Facilities (except for a bankruptcy event of default, in which case such amounts will automatically become due and payable and the lenders’ commitments will automatically terminate).

In the event of a credit rating downgrade below investment grade resulting from a change of control, holders of our senior unsecured notes will have the right to require us to repurchase all or a portion of the senior unsecured notes at a repurchase price equal to 101% of the principal amount of the notes, plus accrued and unpaid interest, if any. The notes are guaranteed, on a senior unsecured basis, by the Guarantor Subsidiaries. The indenture governing the notes contains covenants that, among other things, limit our ability and the ability of the subsidiary guarantors to: create or incur certain liens; enter into certain sale and leaseback transactions; and enter into certain mergers, consolidations and transfers of substantially all of our assets. The indenture also contains a cross default provision which is triggered if we default on other debt of at least $75 million in principal which is then accelerated, and such acceleration is not rescinded within 30 days of the notice date.

We are currently in compliance with all covenant requirements.

Leasing Commitments

Refer to Note 5 in the Notes to the Consolidated Financial Statements for more details on our leasing commitments.

Guarantees related to our Debt Obligations

Our senior unsecured notes were issued by Lennox International Inc. (the “Parent”) and are unconditionally guaranteed by certain of our subsidiaries (the “Guarantor Subsidiaries”) and are not secured by our other subsidiaries. The Guarantor Subsidiaries are 100% owned and consolidated, all guarantees are full and unconditional, and all guarantees are joint and several.

The following combined Parent and Guarantor Subsidiaries financial information is presented as of December 31, 2025 and for the year ended December 31, 2025 (in millions):

Off Balance Sheet Arrangements

We have no off-balance sheet arrangements that we believe may have a material current or future effect on our financial condition, liquidity or results of operations.

Contractual Obligations

Contractual obligations arise in the normal course of business and include debt and related interest payments, leases, purchase obligations, pension and post-retirement benefits and warranty liabilities. For additional information regarding our contractual obligations, see Note 5 of the Notes to the Consolidated Financial Statements. See Note 10 of the Notes to the Consolidated Financial Statements for more information on our pension and post-retirement benefits obligations. See Note 13 of the Notes to the Consolidated Financial Statements for more information on our debt obligations.

Fair Value Measurements

Fair value is the price that would be received to sell an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date and requires consideration of our creditworthiness when valuing certain liabilities. Our framework for measuring fair value is based on a three-level hierarchy for fair value measurements.

The three-level fair value hierarchy for disclosure of fair value measurements is defined as follows:

Level 1 - Quoted prices for identical instruments in active markets at the measurement date.

Level 2 - Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets at the measurement date and for the anticipated term of the instrument.

Level 3 - Valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable inputs that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.

Where available, the fair values were based upon quoted prices in active markets. However, if quoted prices were not available, then the fair values were based upon quoted prices for similar assets or liabilities or independently sourced market parameters, such as credit default swap spreads, yield curves, reported trades, broker/dealer quotes, interest rates and benchmark securities. For assets and liabilities without observable market activity, if any, the fair values were based upon discounted cash flow methodologies incorporating assumptions that, in our judgment, reflect the assumptions a marketplace participant would use. Valuation adjustments to reflect either party’s creditworthiness and ability to pay were incorporated into our valuations, where appropriate, as of December 31, 2025 and 2024, the measurement dates. See Note 16 of the Notes to the Consolidated Financial Statements for more information on the assets and liabilities measured at fair value.

Market Risk

Commodity Price Risk

We enter into commodity futures contracts to stabilize prices expected to be paid for raw materials and parts containing high copper and aluminum content. These contracts are for quantities equal to or less than quantities expected to be consumed in future production. Fluctuations in metal commodity prices impact the value of the futures contracts that we hold. When metal commodity prices rise, the fair value of our futures contracts increases. Conversely, when commodity prices fall, the fair value of our futures contracts decreases. Information about our exposure to metal commodity price market risks and a sensitivity analysis related to our metal commodity hedges is presented below (in millions):

Refer to Note 9 of the Notes to the Consolidated Financial Statements for additional information regarding our commodity futures contracts.

Interest Rate Risk

Our results of operations can be affected by changes in interest rates due to variable rates of interest on our debt facilities, cash, cash equivalents and short-term investments. A 10% adverse movement in the levels of interest rates across the entire yield curve would have resulted in an increase to pre-tax interest expense of approximately $1.1 million, $0.9 million and $2.3 million for the years ended December 31, 2025, 2024 and 2023, respectively.

From time to time, we may use an interest rate swap hedging strategy to eliminate the variability of cash flows in a portion of our interest payments. This strategy, when employed, allows us to fix a portion of our interest payments when interest rates are low. As of December 31, 2025 and 2024, no interest rate swaps were in effect.

Foreign Currency Exchange Rate Risk

Our results of operations are affected by changes in foreign currency exchange rates. Net sales and expenses in foreign currencies are translated into U.S. dollars for financial reporting purposes based on the average exchange rate for the period. Our primary exposure to foreign currencies are the Canadian dollar, Mexican Peso, and the Euro. During 2025, 2024 and 2023, net sales from outside the U.S. represented 7%, 6% and 11%, respectively, of our total net sales. For the years ended December 31, 2025, 2024, and 2023, foreign currency transaction gains and losses did not have a material impact to our results of operations. A 10% change in foreign exchange rates would have had an estimated $5.8 million, $2.6 million and $5.6 million impact to net income for the years ended December 31, 2025, 2024 and 2023, respectively.

We seek to mitigate the impact of currency exchange rate movements on certain short-term transactions by periodically entering into foreign currency forward contracts. By entering into forward contracts, we lock in exchange rates that would otherwise cause losses should the U.S. dollar appreciate and gains should the U.S. dollar depreciate. Refer to Note 9 of the Notes to the Consolidated Financial Statements for additional information regarding our foreign currency forward contracts.

Critical Accounting Estimates

A critical accounting estimate is one that requires difficult, subjective or complex estimates and assessments and is fundamental to our results of operations and financial condition. The following describes our critical accounting estimate related to product warranties and product-related contingencies and how we develop our judgments, assumptions and estimates about future events and how such policies can impact our financial statements. This discussion and analysis should be read in conjunction with our Consolidated Financial Statements and related Notes in “Item 8. Financial Statements and Supplementary Data.”

Product Warranties and Product-Related Contingencies

The estimate of our liability for future warranty costs requires us to make assumptions about the amount, timing and nature of future product-related costs. Some of the warranties we issue extend 10 years or more in duration and a relatively small adjustment to an assumption may have a significant impact on our overall liability.

From time to time, we may also incur costs to repair or replace installed products experiencing quality issues in order to satisfy our customers and protect our brand. These product-related costs may not be covered under our warranties and are not covered by insurance.

We periodically review the assumptions used to determine the liabilities for product warranties and product-related contingencies and we adjust our assumptions based upon factors such as actual failure rates and cost experience. Numerous factors could affect actual failure rates and cost experience, including the amount and timing of new product introductions, changes in manufacturing techniques or locations, components or suppliers used. Should actual costs differ from our estimates, we may be required to adjust the liabilities and to record expense in future periods. See Note 5 in the Notes to the Consolidated Financial Statements for more information on our product warranties and product-related contingencies.

Recent Accounting Pronouncements

See Note 2 in the Notes to the Consolidated Financial Statements for disclosure of recent accounting pronouncements and the potential impact on our financial statements and disclosures.

The information required by this item is included under the caption “Market Risk” in Item 7 above.

MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. As defined by the Securities and Exchange Commission, internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Consolidated Financial Statements in accordance with U.S. generally accepted accounting principles.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management, including our Chief Executive Officer and Chief Financial Officer, has undertaken an assessment of the effectiveness of the Company’s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) by the Committee of Sponsoring Organizations of the Treadway Commission. Management’s assessment included an evaluation of the design of the Company’s internal control over financial reporting and testing of the operational effectiveness of those controls.

Based on this assessment, management concluded that as of December 31, 2025, the Company’s internal control over financial reporting was effective.

Ernst & Young LLP, the independent registered public accounting firm that audited the Company’s Consolidated Financial Statements, has issued an audit report including an opinion on the effectiveness of our internal control over financial reporting as of December 31, 2025, a copy of which is included herein.

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Lennox International Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheet of Lennox International Inc. and subsidiaries (the Company) as of December 31, 2025, the related consolidated statements of operations, comprehensive income (loss), stockholders' equity (deficit) and cash flows for the year then ended, and the related notes and Schedule II – Valuation and Qualifying Accounts and Reserves listed in the Index at Item 15 for the year ended December 31, 2025 (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025, and the results of its operations and its cash flows for the year then ended, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 17, 2026 expressed an unqualified opinion thereon.

Change in Accounting Principle

As discussed in Note 2 to the consolidated financial statements, the Company has elected to change its method of accounting for certain inventories to the first-in, first-out (“FIFO”) method effective October 1, 2025, with retrospective application to all periods presented.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’s financial statements based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audit also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audit provides a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.

Product Warranty Liability

To test the product warranty liability, our audit procedures included, among others, evaluating the key assumptions and the underlying data used by the Company in developing the liability estimate. As management utilizes historical trends in failure rates and average cost of failures relative to its product categories and warranty terms, we evaluated management’s methodology for determining the failure rate and cost of failure assumptions by comparing these key assumptions to trends observed in historical Company claims data. We also performed sensitivity analyses to determine the effect of changes in assumptions, where appropriate. We also tested completeness and accuracy of underlying claims data used in management’s estimation calculations and performed recalculations to evaluate the accuracy of the model used by management to determine the estimate.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2025.

Dallas, Texas

February 17, 2026

Report of Independent Registered Public Accounting Firm

To th

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None.

Disclosure Controls and Procedures

As required by Rule 13a-15 under the Exchange Act, we carried out an evaluation, under the supervision and with the participation of our current management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures as of the end of the period covered by this report. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and circumvention or overriding of the controls and procedures. Accordingly, even effective disclosure controls and procedures can only provide reasonable assurance of achieving their control objectives. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of December 31, 2025, our disclosure controls and procedures were effective to provide reasonable assurance that information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the applicable rules and forms, and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure.

Management’s Annual Report on Internal Control Over Financial Reporting

See “Management’s Report on Internal Control Over Financial Reporting” included in Item 8 “Financial Statements and Supplementary Data.”

Attestation Report of the Independent Registered Public Accounting Firm

See “Report of Independent Registered Public Accounting Firm” included on page 37 of Item 8 “Financial Statements and Supplementary Data.”

Changes in Internal Control Over Financial Reporting

There were no changes during the year ended December 31, 2025 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Rule 10b5-1 Plan Elections

Daniel M. Sessa, Executive Vice President and Chief Human Resources Officer, adopted a prearranged stock trading plan on November 10, 2025. Mr. Sessa’s plan provides for the sale of approximately 3,685 shares of the Company's common stock and the exercise and sale of approximately 5,058 stock appreciation rights between February 13, 2026 and October 30, 2026.

This trading plan was entered into during an open insider trading window and is intended to satisfy the affirmative defense of Rule 10b5-1(c) under the Exchange Act and the Company's policies regarding transactions in the Company's securities.

None.

PART III

Our Code of Ethics (which we call our Code of Business Conduct) applies to all employees, officers and directors including our principal executive officer, principal financial officer and principal accounting officer, and is posted on our website at www.lennox.com. Amendments to or waivers of our Code of Business Conduct for our principal executive officer, principal financial officer and principal accounting officer, if any, will be posted on our website.

The remainder of the response to this item is incorporated herein by reference from the Company’s definitive proxy statement, which will be filed no later than 120 days after December 31, 2025. Also, refer to Part I, Item 1 “Business - Information about our Executive Officers” of this Annual Report on Form 10-K, which identifies our executive officers and is incorporated herein by reference.

Incorporated herein by reference from the Company’s definitive proxy statement, which will be filed no later than 120 days after December 31, 2025.

Incorporated herein by reference from the Company’s definitive proxy statement, which will be filed no later than 120 days after December 31, 2025. Also, refer to Note 15 in the Notes to the Consolidated Financial Statements for additional information about our equity compensation plans.

Incorporated herein by reference from the Company’s definitive proxy statement, which will be filed no later than 120 days after December 31, 2025.

Our independent registered public accounting firm is Ernst & Young LLP, Dallas, TX, Auditor Firm ID: 42.

Incorporated herein by reference from the Company’s definitive proxy statement, which will be filed no later than 120 days after December 31, 2025.

PART IV

Financial Statements

The following financial statements are included in Part II, Item 8 of the Annual Report on Form 10-K:

• Report of Independent Registered Public Accounting Firm (KPMG LLP, Dallas, TX, Auditor Firm ID: 185)

• Report of Independent Registered Public Accounting Firm (Ernst & Young LLP, Dallas, TX, Auditor Firm ID: 42)

• Consolidated Balance Sheets as of December 31, 2025 and 2024

• Consolidated Statements of Operations for the Years Ended December 31, 2025, 2024 and 2023

• Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2025, 2024 and 2023

• Consolidated Statements of Stockholders’ Equity (Deficit) for the Years Ended December 31, 2025, 2024 and 2023

• Consolidated Statements of Cash Flows for the Years Ended December 31, 2025, 2024 and 2023

• Notes to the Consolidated Financial Statements for the Years Ended December 31, 2025, 2024 and 2023

Financial Statement Schedules

The financial statement schedule included in this Annual Report on Form 10-K is Schedule II - Valuation and Qualifying Accounts and Reserves for the Years Ended December 31, 2025, 2024 and 2023 (see Schedule II immediately following the signature page of this Annual Report on Form 10-K).

Financial statement schedules not included in this Annual Report on Form 10-K have been omitted because they are not applicable or the required information is shown in the Consolidated Financial Statements or Notes thereto.

Exhibits

A list of the exhibits required to be filed or furnished as part of this Annual Report on Form 10-K is set forth in the Index to Exhibits, which immediately precedes such exhibits, and is incorporated herein by reference.

INDEX TO EXHIBITS

None.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

LENNOX INTERNATIONAL INC.

By: /s/ Alok Maskara

Alok Maskara

Chief Executive Officer

February 17, 2026

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant in the capacities and on the dates indicated.

LENNOX INTERNATIONAL INC.

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES

For the Years Ended December 31, 2025, 2024 and 2023

(In millions)