Comfort Systems U (FIX)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-10 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: 2026-08-10 | Code: S (Open market sale) Shares: -3,500 | Price: $1,690.47 Total Value: $5,916,647.45 Shares Owned After: 58,615 | Ownership: D (Direct) Footnotes: [F1] Represents the average price of shares sold; full information regarding the number of shares sold and specific prices will be made available upon request to the Company's Office of the General Counsel. [Transaction #2] Security: Common Stock Date: 2026-08-11 | Code: S (Open market sale) Shares: -4,000 | Price: $1,693.92 Total Value: $6,775,690.80 Shares Owned After: 8,495 | Ownership: I (Indirect) | Nature: Partnership Interest Footnotes: [F1] Represents the average price of shares sold; full information regarding the number of shares sold and specific prices will be made available upon request to the Company's Office of the General Counsel. [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: Represents the average price of shares sold; full information regarding the number of shares sold and specific prices will be made available upon request to the Company's Office of the General Counsel. 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 (2026-08-12)