Posted by TomIn on October 31, 2022 at 04:18:26 from (23.118.149.246):
In Reply to: Heating my garage posted by andy r on October 30, 2022 at 18:52:59:
A lot of opinions have already been expressed. Several key points have not been addressed (yet).
You DO NOT want to share ductwork in your garage with ductwork in your house. If your home heating system is large enough, it doesn't seem like a bad idea to use the excess capacity to heat your garage. The problem is in the cold air return system. Codes (and common sense) don't allow returning air from the garage with the possibility of all sorts of fumes into the home living area.
When comparing gas and electric heaters you need to realize that gas heaters are rated at INPUT btu. The brands you mentioned are about 80% efficient, so a 50,000 btu gas heater will supply about 40,000 btu of heat. A 5,000-watt electric heater will supply about 17,000 btu of heat since electric resistance heat is nearly 100% efficient.
From my own experience in central Indiana, I have a three-car garage with 10' ceilings. It has a ceiling hung gas heater of about 100,000 btu. I rarely use the heater, but it will heat up the garage to comfortable temperature in just a few minutes when I want to work in the garage. I had a neighbor who built a huge detached garage some years back. He walled off a 16' x 22' work room on one end. In the winter he kept a $15 1500 watt electric heater going to keep things from freezing. When he wanted to work in the winter, he plugged in one or two additional heaters a few hours before he intended to spend the day working. That solution worked fine for him. You haven't mentioned the size of your garage, how often you will want it heated, your location/climate, and other factors that would influence your heat load. The best garage doors aren't that well insulated or sealed. Heat loss is greater if they are opened frequently.
You haven't mentioned whether your current gas and/or electric systems have enough excess capacity to supply heat to your garage.
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