I have a 30x40 2x6 10ft walls. I heat it with a hotdawg heater I believe I ordered it from air and water out of nebraska. The walls have 2 inches of spray foam and 4 inch batting over that. My only though with the house style heater would be trying to have it upstairs in a central location so your ductwork would go out 20 feet in each direction. It would be interesting to know how much it will take to heat the upstairs part of the garage, might not take much at all. How much will you be in that area? One nice thing is you could hook up central air to the house unit that would be nice. It will be -10 at least tomorrow morning and probably about 35 in the garage with no heat on.
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