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I have the same size garage. What I do is plug in a 1500 watt portable rotating heater that works just fine. No forced air, just goes back and forth about 180 degrees and my band plays in the garage without *****ing.
If I am working on the cars... I put it close to the work area.
We don't have gas on my street so I do what I can with the AC power.
The oil filled radiator heaters don't do squat.
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