An efficient and well-maintained heat exchanger is essential for a working furnace. During the process of heating the heat exchanger, combustion gases should be venting safely out of the house.
The most common type of furnace is a gas-powered central air system, which heats air in a one area and then distributes it throughout the home via ductwork and vents.
If you have a 90% AFUE furnace, 90% of the fuel is used to directly heat your home. The remaining 10% is lost. High-efficiency furnaces have AFUE percentages above 90%. Think of AFUE as the gas mileage of your furnace.
This system is also known as a ducted warm-air or forced warm-air distribution system.
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