If you're in a cold climate and have high ceilings look into Infrared Heaters (Propane burner with a long black pipe and a reflector), I have them in my shop with 16' ceilings and they are great and economical to rum. They heat the solid objects (floor, tools, vehicles, etc.) and not the air. they even work with the door open! You see them in car dealerships. I have them wall mounted about 13' off the floor.
Mike B
