COMFORT SYSTEMS USA INC

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a)

OF THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. )

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Comfort Systems USA, Inc.

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ANNUAL STOCKHOLDER MEETING

FRIDAY, May 17, 2024

11:00AM CENTRAL TIME

THE HOUSTONIAN HOTEL

111 NORTH POST OAK LANE, HOUSTON, TEXAS 77024

We build legacies.

Comfort Systems USA is composed of more than 40 operating companies in approximately 170 locations across the United States. We are a leading building and service provider for mechanical, electrical, and plumbing building systems. Our national footprint provides us the ability to meet your objectives to build and maintain safe, comfortable, and efficient facilities.

Across the United States, companies turn to Comfort Systems USA for our unparalleled expertise in mechanical and electrical services, process piping, modular construction, controls, energy efficiency, and countless other nonresidential building renovation and service needs. We focus on a long-term approach by emphasizing safety and sustainability in everything we do. You can count on Comfort Systems USA to integrate planning, engineering, and implementation to provide you with a customized approach to all of your complex building needs.

WE BUILD LEGACIES

WITH OUR

CUSTOMERS

by safely installing and maintaining their most critical building systems

PEOPLE

by providing the tools and paths for individual career achievement

ACQUISITIONS

by preserving and advancing their life’s work

OUR VALUES

Be safe.

Be honest.

Be respectful.

Be innovative.

Be collaborative.

Our values define, inform, and guide the way we operate on a daily basis,

both within the company and in the communities where we do business.

Comfort Systems USA, Inc. 675 Bering Drive, Suite 400 Houston, Texas 77057