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AFVEAnnual Fuel Utilization Efficiency
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A property is considered energy efficient if it features, among other things, gas furnaces with an annual fuel utilization efficiency (AFUE) rating of 80 percent or better, vent dampers and/or pilotless ignitions.
AFUE refers to Annual Fuel Utilization Efficiency (sometimes called "seasonal efficiency") - a gauge of how well a heating system extracts heat and delivers it to the living space.
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