Item 16. Form 10-K Summary

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Item 16. Form 10-K Summary

None.

INDEX OF EXHIBITS


		Incorporated by Referenceto the Exhibit Indicated Belowand to the Filing with theCommission Indicated Below
ExhibitNumber	Description of Exhibits	ExhibitNumber	Filing or File Number
3.1	Second Amended and Restated Certificate of Incorporation of the Registrant	3.1	333-24021
3.2	Certificate of Amendment dated May 21, 1998	3.2	1998 Form 10-K
3.3	Certificate of Amendment dated July 9, 2003	3.3	2003 Form 10-K
3.4	Certificate of Amendment dated May 20, 2016	3.1	May 20, 2016 Form 8-K
3.5	Amended and Restated Bylaws of Comfort Systems USA, Inc.	3.1	March 25, 2016 Form 8-K
4.1	Form of certificate evidencing ownership of Common Stock of the Registrant	4.1	333-24021
4.2	Description of Registrant’s Securities	4.2	2019 Form 10-K
*10.1	Employment Agreement between the Company, Eastern Heating & Cooling, Inc. and Alfred J. Giardinelli, Jr.	10.1	Second Quarter 2003 Form 10-Q
*10.2	Form of Comfort Systems USA, Inc. Executive Severance Policy	10.3	First Quarter 2008 Form 10-Q
*10.3	Form of Directors and Officers Indemnification Agreement	10.1	May 19, 2009 Form 8-K
10.4	Second Amended and Restated Credit Agreement by and among Comfort Systems USA, Inc., as Borrower and Wells Fargo Bank, National Association, as Administrative Agent/Wells Fargo Securities LLC, as Sole Lead Arranger and Sole Lead Book Runner/Bank of Texas, N.A., Capital One, N.A., and Regions Bank as Co-Syndication Agent/and Certain Financial Institutions as Lenders	10.1	July 22, 2010 Form 8-K/A
10.5	Stock Purchase Agreement, dated July 28, 2010	10.1	July 30, 2010 Form 8-K
10.6	Amendment No. 1 to Second Amended and Restated Credit Agreement, Second Amended and Restated Security Agreement, and Second Amended and Restated Pledge Agreement	10.1	Third Quarter 2011 Form 10-Q
10.7	Amendment No. 2 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents	10.1	Second Quarter 2013 Form 10-Q
*10.8	Form of Option Award under the Comfort Systems USA, Inc. 2012 Equity Incentive Plan	10.33	2014 Form 10-K
10.9	Amendment No. 3 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents	10.1	Third Quarter 2014 Form 10-Q
10.10	Agreement and Plan of Merger between the Company and Dyna Ten Corporation, dated April 7, 2014	10.1	April 9, 2014 Form 8-K
*10.11	Form of Amended Change in Control Agreement	10.1	Third Quarter 2015 Form 10-Q
10.12	Amendment No. 4 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents	10.40	2015 Form 10-K
*10.13	Form of 2016 Stock Option Notice	10.3	March 25, 2016 Form 8-K
*10.14	Resignation and General Release Agreement between the Company and James Mylett, dated as of January 10, 2017	10.1	January 11, 2017 Form 8-K

		Incorporated by Referenceto the Exhibit Indicated Belowand to the Filing with theCommission Indicated Below
ExhibitNumber	Description of Exhibits	ExhibitNumber	Filing or File Number

10.15	Stock Purchase Agreement, dated February 21, 2017, by and among the Company, BCH, the Selling Shareholders and Daryl Blume, in his capacity as representative of the Selling Shareholders	2.1	February 23, 2017 Form 8-K
10.16	Form of Promissory Note, dated April 1, 2017, issued by the Company in favor of each of the Selling Shareholders	10.1	April 3, 2017 Form 8-K
*10.17	2017 Omnibus Incentive Plan	A	April 10, 2017 Proxy Statement
*10.18	2017 Senior Management Annual Performance Plan	B	April 10, 2017 Proxy Statement
*10.19	Form of Restricted Stock Unit Agreement under the Company’s 2012 Equity Incentive Plan	10.2	First Quarter 2017 Form 10-Q
*10.20	Form of Stock Option Notice under the Company’s 2012 Equity Incentive Plan	10.3	First Quarter 2017 Form 10-Q
*10.21	Form of Dollar-denominated Performance Restricted Stock Unit Agreement under the Company’s 2012 Equity Incentive Plan	10.4	First Quarter 2017 Form 10-Q
*10.22	Form of Restricted Stock Unit Agreement under the Company’s 2017 Omnibus Incentive Plan	10.1	First Quarter 2018 Form 10-Q
*10.23	Form of Stock Option Notice under the Company’s 2017 Omnibus Incentive Plan	10.2	First Quarter 2018 Form 10-Q
*10.24	Form of Dollar-denominated Performance Restricted Stock Unit Agreement under the Company’s 2017 Omnibus Incentive Plan	10.3	First Quarter 2018 Form 10-Q
10.25	Amendment No. 5 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents	10.1	Second Quarter 2018 Form 10-Q
10.26	Purchase Agreement, dated February 21, 2019, by and among the Company, Walker, the Shareholder Sellers and Scott Walker, in his capacity as representative of the Shareholder Sellers	2.1	February 26, 2019 Form 8-K
10.27	Amendment No. 6 to Second Amended and Restated Credit Agreement and Amendment to Other Loan Documents	10.56	2019 Form 10-K
10.28	Agreement and Plan of Merger dated as of March 9, 2020 among Comfort Systems USA, Inc., OSC Acquisition Corp., TAS Energy Inc., and Element Partners II, L.P., as Stockholder Representative	2.1	March 13, 2020 Form 8-K
*10.29	Resignation and General Release Agreement between Comfort Systems USA, Inc. and Terrence Young, dated as of January 18, 2022	10.1	January 19, 2022 Form 8-K
10.30	Third Amended and Restated Credit Agreement dated as of May 25, 2022 by and among Comfort Systems USA, Inc., as Borrower, the Lenders listed on the signature pages thereof, and Wells Fargo Bank, National Association, as Agent for the Lenders	10.1	May 27, 2022 Form 8-K/A
*10.31	Form of Restricted Stock Unit Agreement with a Blank Vesting Schedule under the Company’s 2017 Omnibus Incentive Plan	10.2	Second Quarter 2022 Form 10-Q
16.1	Letter to Securities and Exchange Commission from Ernst & Young LLP, dated March 15, 2021	16.1	March 15, 2021 Form 8-K
21.1	List of subsidiaries of Comfort Systems USA, Inc.		Filed Herewith
23.1	Consent of Deloitte & Touche LLP		Filed Herewith
23.2	Consent of Ernst & Young LLP		Filed Herewith
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002		Filed Herewith
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002		Filed Herewith
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002		Furnished Herewith
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002		Furnished Herewith

		Incorporated by Referenceto the Exhibit Indicated Belowand to the Filing with theCommission Indicated Below
ExhibitNumber	Description of Exhibits	ExhibitNumber	Filing or File Number
101.INS	Inline XBRL Instance Document		Filed Herewith
101.SCH	Inline XBRL Taxonomy Extension Schema Document		Filed Herewith
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document		Filed Herewith
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document		Filed Herewith
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document		Filed Herewith
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document		Filed Herewith
104	Cover Page Interactive Data File (the cover page XBRL tags are embedded in the Inline XBRL document)

*	Management contract or compensatory plan.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) 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.


	COMFORT SYSTEMS USA, INC.

	By:	/s/ BRIAN E. LANE
		Brian E. Lane
		President and Chief Executive Officer
Date: February 22, 2023

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


Signature	Title	Date

/s/ Brian E. Lane	President, Chief Executive Officer, and	February 22, 2023
Brian E. Lane	Director (Principal Executive Officer)

/s/ William George	Executive Vice President and Chief Financial	February 22, 2023
William George	Officer (Principal Financial Officer)

/s/ Julie S. Shaeff	Senior Vice President and Chief Accounting	February 22, 2023
Julie S. Shaeff	Officer (Principal Accounting Officer)

/s/ Franklin Myers	Chairman of the Board	February 22, 2023
Franklin Myers

/s/ Darcy G. Anderson	Director	February 22, 2023
Darcy G. Anderson

/s/ Herman E. Bulls	Director	February 22, 2023
Herman E. Bulls

/s/ Alan P. Krusi	Director	February 22, 2023
Alan P. Krusi

/s/ Pablo G. Mercado	Director	February 22, 2023
Pablo G. Mercado

/s/ William J. Sandbrook	Director	February 22, 2023
William J. Sandbrook

/s/ Constance E. Skidmore	Director	February 22, 2023
Constance E. Skidmore

/s/ Vance W. Tang	Director	February 22, 2023
Vance W. Tang

/s/ Cindy L. Wallis-Lage	Director	February 22, 2023
Cindy L. Wallis-Lage

Previous: Item 15. Exhibits and Financial Statement Schedules