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WebWhen comparing furnaces, the differences mainly come down to efficiency, followed by the motor type and stages of heating. 90+% AFUE. If you live in the northern half of the US, … Web1 de abr. de 2024 · A downflow furnace is a type of furnace that allows cold air to enter the top of a furnace unit, where it is warmed, and exit the bottom of the furnace. Once warmed, the air then enters a home through air vents. Contrastingly, an upflow furnace includes a fan that blows cold air over a heated surface. images of scottish terriers
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