Comfort Systems U (FIX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-24 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: COMFORT SYSTEMS USA INC (FIX) CIK: 0001035983 --- Reporting Owner --- Name: MYERS FRANKLIN CIK: 0001207002 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-06-24 | Code: S (Open market sale) Shares: -6,700 | Price: $1,954.47 Total Value: $13,094,949.00 Shares Owned After: 62,115 | Ownership: D (Direct) Footnotes: [F1] The Reporting Person contributed FIX common stock to an exchange fund in exchange for shares of the exchange fund. The FIX common stock was valued at $1,954.47 per share for the purpose of determining the number of shares of the exchange fund issuable to the Reporting Person. [F1] The Reporting Person contributed FIX common stock to an exchange fund in exchange for shares of the exchange fund. The FIX common stock was valued at $1,954.47 per share for the purpose of determining the number of shares of the exchange fund issuable to the Reporting Person. --- Holdings --- [Holding #1] Security: Common Stock Ownership: I (Indirect) Footnotes: [F2] The shares held indirectly were transferred from direct to indirect beneficial ownership in a transaction exempt from Section 16 pursuant to Rule 16a-13. --- Footnotes (Complete Index) --- F1: The Reporting Person contributed FIX common stock to an exchange fund in exchange for shares of the exchange fund. The FIX common stock was valued at $1,954.47 per share for the purpose of determining the number of shares of the exchange fund issuable to the Reporting Person. F2: The shares held indirectly were transferred from direct to indirect beneficial ownership in a transaction exempt from Section 16 pursuant to Rule 16a-13. --- Signature --- /s/ /s/ Rachel R. Eslicker, Attorney-in-Fact (2026-06-26)