Comfort Systems USA, Inc. engages in the provision of mechanical and electrical contracting services. It operates through the following segments: Mechanical, Electrical Services, and Corporate. The Mechanical Services segment includes heating, ventilation, and air conditioning, plumbing, piping, and controls, as well as off-site construction, monitoring, and fire protection. The Electrical services segment focuses on installation and servicing of electrical systems. The company was founded by Alfred J. Giardinelli, Jr. And William George III on December 12, 1996 and is headquartered in Houston, TX.