Bay Air Systems is one of the leading contractors in the United States, specializing in heating, ventilation and air conditioning equipment. Headquartered in Concord, Calif., the company has branch offices in San Francisco and San Diego. Established in 1981, it provides a wide range of services, such as commercial air conditioning, designing, installation, servicing and energy management. Bay Air Systems employs trained and experienced technicians and also offers personalized service and radio dispatched delivery vehicles.