I just priced out some propane and propane accessories.
$180 spent at Tractor Supply gets me a 2.6kW (9000BTU/hr) indoor-rated propane heater, a 20lb tank, a CO detector, and 20lbs of propane. $220 for the same thing with 5kW instead.
It would take about $200 in fiberglass to insulate my garage to R13. Whether or not I decide to insulate, I will need to seal the garage, as it's very well ventilated right now. In fact, I should probably start by sealing the garage and seeing how much geothermal heating rises up from my garage's compacted gravel floor.
2.6kW is probably not enough. IF I were able to seal up the garage 100% (not going to happen), 2.6kW running 24/7 is just enough to hold my garage 32°F warmer than the air outside. That's probably not warm enough to really work outside.
There is the electric option, but a 15A circuit can only pass 1.8kW, which isn't enough to heat more than just a person in the garage.
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