Established in 1953, Johnstone Supply Inc. is a cooperative wholesale distributor of heating, ventilation, air conditioning and refrigeration (HVACR) parts, supplies and equipment. Based in Phoenix, Ariz., the firm offers a range of products, including air cleaners, analyzers, backflow preventers, buzzers, energy recovery units, gaskets, test instruments, installation supplies and commercial kitchen supplies. Johnstone Supply Inc. operates more than 340 stores throughout the United States. The firm supplies products from numerous manufacturers, such as Air Guide, AquaGuard, Aspen Manufacturing, Fluke Corporation and Plano Molding Company.