Steven B.,
This is kind of a trick question or trick situation.
When I was in Engineering freshman physics we covered the "black box" scenario. The black box was a sealed environment where everything that you put into it is still there in one form or another. So, if we have a black box that has a variety of things in it such as an air conditioner, a light bulb, a 99% efficient motor, and a dust collector, etc., and it draws (for example) 10 amps at 220 vac (RMS) how much of the power is converted to heat? The correct answer is all of it! The garage of the OP is basically a black box. All of the power going in is still there and converted to heat. So, unfortunately, your comment was not correct. But you are not alone and I'm not singling you out.
I think that if the OP could vent outside that the kinetic energy of the high speed air, etc., would go outside (the black box) and it would reduce the temperature rise. In addition, air leaks in her garage will let in cooler air to replace the air that is getting exhausted.