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FWIW, I keep my 20' x 25' workshop (which has one exterior insulated wall with the other 3consisting of non-insulated garage doors and wall sections that have their other sides exposed to other rooms of my hangar that are kept at 40 degrees most of the winter) at 65-70 degrees all winter long. This room has it's own wall mounted propane gas heater that is rated at 20,000 BTU's. It does have a vent plumbed to the outside of the wall. It does fine even during cold spells here in northwest Ohio. It would take a while to bring it up to temp if I did not keep the thermostat up to at least 50 or so. I think it would do fine in a slightly larger well insulated garage.... especially if you keep the thermostat set at 50 when you are not working out there.
I have propane fired ceiling mount tube heaters in the other larger rooms and they do a better job of bringing a cold room up to temp quickly. I leave them set at 40 to keep the water lines from freezing, but if I need to work on an airplane, they will bring the temp up in an hour or so.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
0% Liberal
Men do not quit playing because they get old.... They get old because they quit playing.
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