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Why does the furnace take so long for to raise the temperature?

I own a townhouse, which isapproximately 2,100 square feet. The size of the furnace is 50,000 Btu/h. It takes 3/4 of an hour to raise the heat from 68 degrees to 71 degrees when the outside temperature is approximately 25 degrees. Why does it take so long for the furnace to raise the temperature 3 degrees?

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Manage My Life
by Manage My Life
April 26th, 2007
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