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Gas Furnaces by Efficiency (AFUE)

Gas Furnaces by Efficiency (AFUE)

What is a good AFUE rating for a gas furnace?

AFUE shows how much fuel becomes heat. 80% AFUE furnaces are lower-cost and vent through metal flue pipe; 90%+ AFUE condensing furnaces waste less fuel, vent through PVC and need a condensate drain. In cold northern states, 95%+ AFUE usually pays back fastest.

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