AFUE
Annual Fuel Utilization Efficiency (AFUE) is a standardized measure of how efficiently a gas furnace or boiler converts fuel into usable heat over an entire heating season. The efficiency is expressed as a percentage, representing the amount of fuel energy that is actually converted into heat versus the portion that is lost during combustion or through the exhaust. For example, an AFUE rating of 90% means that 90% of the fuel is converted into heat for your home, while the remaining 10% is lost.
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