An air furnace is a type of device used for heating up the air in a building or home. It takes in cold air, warms it up, and then releases it back into the space to make it comfortable and cozy. Full definition
2 door electric / gas refrigerator, ducted propane hot air furnace, 50 gallon propane gas tank capacity. (smartrvguide.com)
Eliminating all gaps and cracks has a tremendous impact on your home's ability to retain the heated air your furnace creates. (moneysense.ca)
Another troubling area for me was when we designed a hydronic heating system using the Life Breath Clean Air Furnace that made its hot water with a combination of solar thermal backed up by an on - demand water heater, the calculation for energy consumption was based soley on the AFUE of the back - up water - heater. (energyvanguard.com)