AFUE is the acronym for Annual Fuel Utilization Efficiency. AFUE is a rating that reflects how efficiently a gas furnace converts fuel to energy. The higher the AFUE, the more efficient the unit is at heating your home. That’s good for your wallet.
AFUE = (Total annual heat output in BTUs / Total annual energy input in BTUs) x 100
An AFUE rating of 90 means that the furnace utilizes approximately 90% of the fuel to provide warmth to your home, while the remaining 10% escapes as exhaust.
A standard efficiency furnace has an AFUE of around 80%. A high-efficiency furnace has an AFUE of 90% or higher. Higher-efficiency furnaces will cost more upfront, but the increased efficiency may result in lower utility bills.
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By Anne Fonda, Content Writer
Expert review by John Kim, Senior Product Manager, Furnaces
HSPF measures the efficiency of a heat pump over an entire heating season. The higher the HSPF, the more efficient the heat pump.
SEER measures the efficiency of a heat pump or air conditioner over an entire cooling season. The higher the SEER, the more efficient the system.
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