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What does the AFUE rating mean?

April 26, 2017AFUE mean rating

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What does the AFUE rating mean?

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Annual Fuel Utilization Efficiency — Indicated as a percentage, your furnace’s AFUE tells you how much energy is being converted to heat. For example, an AFUE of 90 means that 90% of the fuel is being used to warm your home, while the other 10% escapes as exhaust with the combustion gases.