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[16 Mar 2009 | One Comment | 10,777 views]

This is a loaded question and unfortunately is one I can’t answer without a lot more information. I can break it down for you as best I can generically and let you plug in the numbers yourself.
First, understand that all furnaces are not created equal. Some are energy star certified, some aren’t. Some are high efficiency units, some are not. Some are old, some are new. Some are sized correctly for the living space, some are not.
Let’s take the variables one at a time. First, I’m going to assume that …