Re: Resawing box stock on the table saw.
FWIW, in my 1 car, uninsulated garage/shop, i use a 30K btu tank top propane heater. about 2' above it, i mounted a cheap 20" box fan. start the heater, switch the fan on low and in 1 hour, it's comfortable enough to work without a coat with outdoor temps. in the 20s. without insulation and plenty of drafts, fresh air replacement isn't an issue. it's fast, cheap and functional.
there's a solution to every problem.....you just have to be willing to find it.