Air-Conditioning Systems FEDDERS have been a highly respected and recognized name in the heating and air conditioning community for many years. FEDDERS entered the air conditioning industry with the production of room air or “window units”. They have been a driving force in western markets, supplying quality products for over 40 years. FEDDERS air con products are known for their reliability and long life. The excellent quality and an especially wide product range offer a clear advantage to our customers.