For more than 90 years, Wittichen Supply Company has been distributing heating, ventilating and air conditioning (HVAC) products. Based in Birmingham, Ala., the company also offers refrigeration parts, equipment and supplies. It carries products from a selection of brands, including Fujitsu, Ruud, Fluke, Hart and Cooley, Rheem, Honeywell and Johns Manville. The supply company operates more than 24 stores across the United States. Wittichen Supply Company is a member of the Key Wholesaler Group Association.