FIX

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.

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.

This transaction represents a charitable donation.

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.

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.

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.

Shares held directly by the Reporting Person, including 170 shares held indirectly by the Reporting Person.

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.

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.

Held by Kapoor Family Trust, dated August 20, 2023, for which the Reporting Person and his spouse are trustees.

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.

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.

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.

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.

Held by Kent L. Lage and Cindy L. Wallis-Lage Trust, dated December 21, 2017, for which the Reporting Person and her spouse are trustees.

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.

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.

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.

This transaction represents a charitable donation.

This transaction represents a charitable donation.

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.

This transaction represents a charitable donation.

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.

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.

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.

Shares held directly by the Reporting Person, including 170 shares held indirectly by the Reporting Person.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the third and final vesting of restricted stock units granted on March 21, 2023.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the first vesting of restricted stock units granted on March 19, 2025.

Price is based on the average of the high and low stock price on April 1, 2026.

Forfeited shares are related to restricted stock units that vested on April 1, 2026 and were priced based on the average of the high and low stock price on April 1, 2026.

Reflects forfeited shares related to the second vesting of restricted stock units granted on March 20, 2024.

Price is based on the average of the high and low stock price on April 1, 2026.

Reflects dollar-denominated performance restricted stock units granted on March 21, 2023 that vested on March 23, 2026. These units vested as a result of the Company's 2023-2025 relative Total Shareholder Return and 2023-2025 Company average EPS, which are the applicable performance measures.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Reflects dollar-denominated performance restricted stock units granted on March 21, 2023 that vested on March 23, 2026. These units vested as a result of the Company's 2023-2025 relative Total Shareholder Return and 2023-2025 Company average EPS, which are the applicable performance measures.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Forfeited shares are related to dollar-denominated performance restricted stock units that vested on March 23, 2026 and were priced based on the closing price of the Company common stock on March 23, 2026.

Each restricted stock unit granted on March 23, 2026 represents a right to receive one share of common stock and will vest in equal installments over a three-year vesting schedule.

Reflects dollar-denominated performance restricted stock units granted on March 21, 2023 that vested on March 23, 2026. These units vested as a result of the Company's 2023-2025 relative Total Shareholder Return and 2023-2025 Company average EPS, which are the applicable performance measures.