I have a forced hot air furnace (Modine) in my garage, it blows very hot, dry air. My booth (seperate room) filters intake the air in the corner, it goes across the car, then out the fan. I crank it to about 80, and can usually get a whole coat on before I have to let it "catch up," the temp usually goes down very fast with the fan on. I never turn it off, but I do regulate fresh air in the room where the furnace is, by opening a window an inch or so. I close it to "catch up," then open it again when ready for the second coat. Works well, until the temp is below freezing, then I have to wait until Spring! I don't have a moisture problem, just the usual dust problems. But my furnace is a cocker! It came with the place, but the seller wanted to remove it when he sold the house. Nice try, but it was in the contract, lol!