A furnace works by blowing heated air through ducts that deliver the warm air to rooms throughout the house via air registers or grills. This type of heating system is called a ducted warm-air or forced warm-air distribution system. It can be powered by electricity, natural gas, or fuel oil.
Also referred to as a forced air system, the furnace acts as the core of your home's central air system, used for creating warm air as well as participating in the cooling process. Furnaces can use natural gas, propane, heating oil, or electricity to heat your home.
