Sterling Sterling HVAC equipment, A Mestek Company, is proudly "Made in the USA". Sterling has been a major producer of CSA certified Gas Fired and Hydronic Unit Heaters for over 40 years. High and Low Intensity Infrared, Rooftop Duct Furnaces, Evaporative Cooling Units, Packaged HVAC Rooftop and Indoor Make-Up Air Units, and a full line of Industrial Products enhance Sterling's complete line of HVAC equipment. Visit Sterling: http://www.sterlinghvac.com/