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Tight House Heating Loads I just finished reading the cover article of the May issue ("Insulating With Exterior Spray Foam"), and it left me curious. Under the "Mechanicals" section, the author reports that the Manual J calculation for the 2,000 square feet of the main living area gave 22,000 Btu/hr. I don't question that, given the construction and insulation levels described. But then the author states that "adding the basement and office space above the conventionally framed garage to the calculations brought the total design heat load to almost 60,000 Btu." That almost triples the load. I wasn't...

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