More than 45,000 commercial and residential products are available from Comfort Control Johnstone Supply s Web site. Comfort Control Johnstone Supply, also known as Johnstone Supply of West Michigan, is a wholesale only supplier to the heating, ventilation and air conditioning; refrigeration; appliance; and property maintenance industries. The company is comprised of four Johnstone branches located in Muskegon, Grand Rapids, Holland and Kalamazoo, Mich. Originally known as Comfort Control Supply Company, the Muskegon Branch opened its doors for business in 1977. Since that time, it has been expanded twice and now totals approximately 33,000 square feet. Nationally, Johnstone Supply is comprised of more than 280 locally-owned stores.