Since 1936, Koch Air, LLC has been a privately owned, full service distributor of Carrier, Bryant, and Payne residential and ... commercial HVAC equipment, parts, supplies and tools. Other lines include Totaline, Honeyell, Aprilaire, NuCalgon, Modine, Takagi, Slant/Fin, and many more. Based in Evansville, IN, Koch Air also has locations in Indianapolis, IN, Ft. Wayne, IN, St. Louis, MO, Mt. Vernon, IL, Paducah, KY, Lexington, KY and Louisville, KY. read more