Item 5. Other Information

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Item 5. Other Information

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Securities Trading Plans of Directors and Officers

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During the three months ended June 30, 2026, no directors or officers of the Company adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as defined in Item 408(a) and (c) of Regulation S-K.

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Item 6. Exhibits

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​​​​Incorporated by Referenceto the Exhibit Indicated Belowand to the Filing with the****Commission Indicated Below
Exhibit****Number​ ​ ​Description of Exhibits​ ​ ​Exhibit****Number​ ​ ​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
31.1*​Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002​​​​
31.2*​Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002​​​​
32.1**​Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002​​​​
32.2**​Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002​​​​
101.INS*​Inline XBRL Instance Document​​​​
101.SCH*​Inline XBRL Taxonomy Extension Schema Document​​​​
101.CAL*​Inline XBRL Taxonomy Extension Calculation Linkbase Document​​​​
101.DEF*​Inline XBRL Taxonomy Extension Definition Linkbase Document​​​​
101.LAB*​Inline XBRL Taxonomy Extension Label Linkbase Document​​​​
101.PRE*​Inline XBRL Taxonomy Extension Presentation Linkbase​​​​
104​Cover Page Interactive Data File (the cover page XBRL tags are embedded in the Inline XBRL document)​​​​
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*** Filed herewith.**

**** Furnished herewith.**

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SIGNATURES

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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.

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​Comfort Systems USA, Inc.
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July 23, 2026By:/s/ Brian E. Lane
​​Brian E. Lane
​​Chief Executive Officer and Director
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July 23, 2026By:/s/ William George
​​William George
​​Executive Vice President and Chief Financial Officer
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July 23, 2026By:/s/ Julie S. Shaeff
​​Julie S. Shaeff
​​Senior Vice President and Chief Accounting Officer

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