Nothing wrong with using warm compressed air that I know of. It isn't cooled intentionally. It cools as it runs through the pipes. When it cools, moisture in the warm air condenses.
Has anyone considered the LED utility wrap lights? I'm also building a car barn (24'x40' with 12' ceiling). I like the idea of the LED's for a couple reasons...They don't burn out like the fluorescent bulbs (rated for 50,000 hours) and also won't hum or flicker, and of course they're more...