How is Furnace Energy Efficiency Measured?
If you smell gas (sometimes described as a rotten-egg smell), do not operate any electrical components. Evacuate the home and then call your utility company or fire department. Do not reenter the home until a professional has deemed it safe to do so.
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.
The main parts of your furnace are the control system (thermostat and electrical controls), gas valve, burners, heat exchanger, blower, and duct and ventilation system. When your furnace creates heat, combustion gases are vented out of your home via a flue pipe.
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