I have an 840 sq. ft. attached garage with heated room above. Walls are R-28, ceiling is 9' with R-20 between a heated room above.
floor has 2" of foam board around the perimeter with an insulated blanket under the concrete two continuous loops of 3/4" pex within the concrete for floor heating. Two 8 x 10 doors insulated to R=20 and two 40" x 80" south facing double glazed windows. I keep this garage at about 50 degrees.
I have done the heat loss calculations for the rooms in the house but can't find anything to approximate this garage situation.
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