When I moved 90 miles west from the Lake Michigan shoreline to Central Wisconsin I had to rebuild the engine in my '55 F350.
Two car garage no insulation.
I got refridgerator boxes from the local appliance store and stapled them to the ceiling. HD plastic was used on the walls. I ran a 10 gauge extenstion cord for power.
I bought a 35k propane torpedo heater for heat. I still have it. It kept the garage warm in January Wisconsin temps.
I've had barrel stoves, cast iron pot bellies, pellet stoves but now I' m using my 30' radiant gas tube heater hanging from the ceiling.
For over a decade I built my stock cars in an unheated concrete farm building with one outlit and one light bulb. I feel your pain.
