Koch Air 3141 Riverport Tech Center Maryland Heights MO 63043 has been distributing Carrier products since 1936 making it the third oldest Carrier supply house. With over 280 000 square feet of HVAC parts equipment and supplies Koch Air serves quality and service-minded dealers contractors and engineers in the residential commercial and industrial markets. Areas Served: Koch Air operates HVAC supply houses in Indianapolis IN Ft. Wayne IN Lexington KY Louisville KY Paducah KY and St. Louis MO. What Brands Does Koch Air Sell? Koch Air carries a full line of HVAC supplies from Carrier Bryant Payne Factory Authorized Totaline and many others.