Comfort Systems USA, Inc. provides installation, maintenance, repair, and replacement services for heating, ventilation, and air conditioning (HVAC) systems in the mechanical services industry. The company is involved in the design, engineering, integration, installation, and start-up of HVAC, building automation controls, and related systems; and maintenance, repair, replacement, reconfiguration, and monitoring of HVAC systems and industrial process piping. It also provides specialized applications, such as building automation control systems, fire protection, process cooling, electronic monitoring, and process piping. The company offers its services for office buildings, retail centers, apartment complexes, and manufacturing plants, as well as healthcare, education, and government facilities. It serves various customers, including building owners and developers, property managers, general contractors, architects, and consulting engineers in the commercial, industrial and institutional HVAC markets. The company was founded in 1917 and is headquartered in Houston, Texas.