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To size a furnace for a house you need to figure out the square footage of your home. Then you need to do research and check the output of the different furnaces.
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1. Check the size of your current furnace. Your furnace’s equipment panel should indicate input and output ratings (the output usually being 80 percent of the input –
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Two units of measure are important in sizing an oil furnace. The first is the British Thermal Unit or BTU, which represents the energy needed to raise the temperature of one pound
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The size of a furnace is determined by the square footage of the space you are trying to heat. The larger the space the more BTU's (British Thermal Units) needed to heat the area.
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