Gas Furnaces by Efficiency (AFUE): Buying Guide | HVAC365 - Page 6

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Goodman 80,000 BTU 80% AFUE Gas Furnace Upflow/Horizontal Single Stage up to 5 Ton 21" W | GR9S800805CN

SKU: GR9S800805CN
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Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Upflow/Horizontal Single Stage up to 5 Ton 21" W | GR9S800805CX

SKU: GR9S800805CX
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Goodman 100,000 BTU 80% AFUE Gas Furnace Upflow/Horizontal Single Stage up to 5 Ton 21" W | GR9S801005CN

SKU: GR9S801005CN
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Goodman 80,000 BTU 80% AFUE Gas Furnace Upflow/Horizontal Two Stage up to 4 Ton 17.5" W | GR9T800804BN

SKU: GR9T800804BN
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Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Upflow/Horizontal Two Stage up to 4 Ton 17.5" W | GR9T800804BX

SKU: GR9T800804BX
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Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Downflow/Horizontal Single Stage up to 5 Ton 21" W | GD9S800805CX

SKU: GD9S800805CX
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Goodman 80,000 BTU 80% AFUE Gas Furnace Upflow/Horizontal Two Stage up to 4 Ton 21" W | GR9T800804CN

SKU: GR9T800804CN
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Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Upflow/Horizontal Two Stage up to 4 Ton 21" W | GR9T800804CX

SKU: GR9T800804CX
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Goodman 80,000 BTU 80% AFUE Gas Furnace Upflow/Horizontal Two Stage up to 5 Ton 21" W | GR9T800805CN

SKU: GR9T800805CN
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Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Upflow/Horizontal Two Stage up to 5 Ton 21" W | GR9T800805CX

SKU: GR9T800805CX
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$1,644.00
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Goodman

Goodman 80,000 BTU 80% AFUE Gas Furnace Low Nox Downflow/Horizontal Two Stage up to 4 Ton 17.5" W | GD9T800804BX

SKU: GD9T800804BX
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$1,654.00
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Goodman 100,000 BTU 80% AFUE Gas Furnace Low Nox Upflow/Horizontal Single Stage up to 5 Ton 21" W | GR9S801005CX

SKU: GR9S801005CX
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$1,651.00
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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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