Comfort Systems USA, Inc. engages in the provision of mechanical and electrical contracting services. It operates through the following segments: Mechanical Services, Electrical Services, and Corporate. The Mechanical Services segment includes HVAC, plumbing, piping, and controls, as well as off-site construction, monitoring and fire protection. The Electrical services segment handles installation and servicing of electrical systems. The company was founded by Alfred J. Giardinelli, Jr. in 1997 and is headquartered in Houston, TX.