Operational since the May of 1936, Duncan Supply Company Inc. is located in Indianapolis, Ind. It is one of the premier wholesale distributors of refrigeration, air conditioning and heating equipment and accessories. The company's product line consists of refrigeration, HVAC, ice making and water treatment products. Duncan Supply Company Inc. offers services such as in-house engineering, design and build, system sizing/layout, and AutoCAD capability. It serves the central Indiana and Illinois areas. The company caters to the needs of commercial and industrial customers.