Making it easier for HVACR contractors to do business. Johnstone Supply is the leading HVACR wholesale distributor of equipment, parts, and supplies, providing service to Residential, Light Commercial, Refrigeration and Facilities Maintenance contractors. With over 450 locally owned and operated stores nationwide and supported by six regional distribution centers, we offer the best product selection, customer service, training and productivity programs to help you grow your business. Johnstone Supply has been serving the industry since 1953, and proudly supports Operation Homefront with a variety of local activities throughout the year benefiting our wounded veterans and their families.