[David]

I have a 2 ton window unit that keeps my 22 x 43 foot insulated garage pretty cool in the summer. I don't have an insulated door so I cut pieces of foam board to fit the garage door openings and installed a seal around the outside edge.

If I did it again, I'd install a split system. The only problem with the split system is the cost. I spent about $450 for the window unit where a split system would be $1500 or more. The benefit is the loud compressor would be outside.