Comfort Systems U (FIX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-05-18 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: COMFORT SYSTEMS USA INC (FIX) CIK: 0001035983 --- Reporting Owner --- Name: ANDERSON DARCY CIK: 0001199361 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-05-18 | Code: A (Grant or award) Shares: +105 | Price: $0.00 Shares Owned After: 18,140 | Ownership: D (Direct) Footnotes: [F1] Shares granted pursuant to the 2017 Omnibus Incentive Plan as approved by stockholders on May 23, 2017. Non-employee directors are given an annual grant of Comfort Systems USA Common Stock following election or reelection at the Company's annual stockholders' meeting. This year's grant is equal to $200,000, as rounded up to the nearest whole share, based on the average of the high and low price of the Company's Common Stock on the day of the annual stockholders' meeting. --- Footnotes (Complete Index) --- F1: Shares granted pursuant to the 2017 Omnibus Incentive Plan as approved by stockholders on May 23, 2017. Non-employee directors are given an annual grant of Comfort Systems USA Common Stock following election or reelection at the Company's annual stockholders' meeting. This year's grant is equal to $200,000, as rounded up to the nearest whole share, based on the average of the high and low price of the Company's Common Stock on the day of the annual stockholders' meeting. --- Signature --- /s/ /s/ Rachel R. Eslicker, Attorney-in-Fact (2026-05-19)