I've been thinking about this myself. My options are an electric resistance space heater or propane. Electric is super cheap to install, and it pretty much runs on wind, but propane would heat up faster and cost far less per hour. Downside of propane: CO.
Either way, I'd have to seal up all the air gaps in the garage. There's a good 0.5" gap between the overhead door and its frame, plus the window and door leak.
It's plenty warm by garage standards just a few feet underground, all year round. If only there were an economical way to bring that heat to the surface.
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