Forced Air Heating A heating system using fans, ducts, and a furnace/heat pump. An area is heated by convection when warm air is forced and circulated into the living space. Only the air is heated by this system. Warm air is “blown” into the living space at 110-115�F.Related Articles: Glossary: BasementGreen Heating for Your HomeHome Improvements for Your Feet and Your PocketElectrical Thermal StorageJuly Newsletter – Efficiently Warming Your Home