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Im bored, excuse the verbal diarrhea :
The hard part with 12' ceilings is that its hard to fill up the top 6-8 feet of airspace with warm air before it starts getting cold again. If you cant do that, you'll never get warm assuming youre standing on the floor. 30x20x8 is 4800cuft. That's a lot of warm air volume to heat before your head starts to warm up. And since heat rises, it wants to get out through the ceiling. Garages/workshops are not usually well insulated and lose a lot of heat. AC is easier.
I don't want to be the Akkkshuallly guy. I just don't want to see disappointed forumbros and wasted money unless you really just want to work in the cold and go warm your hands every so often by a little heater. If heating the shop reasonably well is more than just a "nice to have" then you need 48k BTU in climate zone 5 (like Oregon) and 32500 in zone 2 (like TX/FL). If you do this with electricity, it will be 30-50 amps and wont come from anything you plug in to a 120v outlet. Propane is ideal for this.
Something like this would probably work and isnt too expensive $200-$300: https://www.lowes.com/pd/DEWALT-DEW...Portable-Forced-Air-Propane-Heater/1001045892
I doubt it puts out 68kbtu as it claims, but if it actually does half that, it should be ok unless you live in the dakotas /michigan UP etc.
Thanks for indulging me. My dad's family business was hvac engineering. I grew up helping do all this stuff. I'm not a current tradesman, but I was licensed in the past.
The hard part with 12' ceilings is that its hard to fill up the top 6-8 feet of airspace with warm air before it starts getting cold again. If you cant do that, you'll never get warm assuming youre standing on the floor. 30x20x8 is 4800cuft. That's a lot of warm air volume to heat before your head starts to warm up. And since heat rises, it wants to get out through the ceiling. Garages/workshops are not usually well insulated and lose a lot of heat. AC is easier.
I don't want to be the Akkkshuallly guy. I just don't want to see disappointed forumbros and wasted money unless you really just want to work in the cold and go warm your hands every so often by a little heater. If heating the shop reasonably well is more than just a "nice to have" then you need 48k BTU in climate zone 5 (like Oregon) and 32500 in zone 2 (like TX/FL). If you do this with electricity, it will be 30-50 amps and wont come from anything you plug in to a 120v outlet. Propane is ideal for this.
Something like this would probably work and isnt too expensive $200-$300: https://www.lowes.com/pd/DEWALT-DEW...Portable-Forced-Air-Propane-Heater/1001045892
I doubt it puts out 68kbtu as it claims, but if it actually does half that, it should be ok unless you live in the dakotas /michigan UP etc.
Thanks for indulging me. My dad's family business was hvac engineering. I grew up helping do all this stuff. I'm not a current tradesman, but I was licensed in the past.
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