Operating in the Pacific Northwest since the 1950s, the company was acquired by W. W. Monroe in 1974. Through more than 20 locations in Alaska, Idaho, Montana, Oregon, and Washington, Thermal Supply has built a business distributing air-conditioning, heating, and refrigeration equipment, parts, and accessories. The company, which grew from a mere three locations over the years, specializes in supplying products from Copeland, Larkin, Manitowoc, Mitsubishi, Sporlan, and other manufacturers.