Comfort Systems USA, Inc. is a provider of heating, ventilation and air conditioning (HVAC) installation, maintenance, repair and replacement services within the mechanical services industry. It operates in the commercial, industrial and institutional HVAC markets and offers services for the industrial, healthcare, education, office, technology, retail and government facilities. In addition to standard HVAC services, the Company provides specialized applications such as building automation control systems, fire protection, process cooling, electronic monitoring and process piping. Its installation business related to newly constructed facilities involves the design, engineering, integration, installation and start-up of HVAC. Its maintenance, repair and replacement business also involves the replacement, reconfiguration and monitoring of HVAC systems and industrial process piping. Certain locations also provide related activities such as electrical service and plumbing.