Paint Booth

George Jets said

Use what is called a "Make Up Air Unit". These propane or natural gas heaters heat the outside air with the flame outside, then they blow the heated air to the inside of your building.

Your local Farm AG Service has them, they are called Hog Barn Heaters.

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BE DAMN CAREFUL what you recommend, some of this stuff can be an explosion hazard. Are these a "direct fired" unit? If so, this is NOT what you want for a paint situation. You want a furnace/ heater with a heat exchanger, AND with (several terminologies) sealed combustion chamber, outside combustion air (pipe dedicated to the burner air)

Most ELECTRIC ducted furnaces are not safe in a painting environment, because the heating elements are in effect 'direc fired' that is, they are in the heated space's duct/ airstream