Spectrum Mechanical, 9760 Research Dr, Irvine, CA 92618, US

Western Allied Corporation has designed, constructed, retrofitted and maintained heating, ventilation and air conditioning (HVAC) systems throughout California for more than four decades. The company provides several services, such as pre-construction consultation, which includes project planning, estimating and budgeting; preventive maintenance and full coverage of HVAC equipment and systems; retrofit and replacement of HVAC equipment and systems, including controls and building automation systems; repair of HVAC equipment, ductwork and piping; construction of HVAC systems for new and existing buildings; and process piping, as well as supply and exhaust system design and construction for the electronic chip, wafer, plastics, polystyrene, pharmaceutical and food industries. Western Allied was founded in Santa Fe Springs, Calif., in 1961.