The "horsepower loss" story is pretty much of a myth, unless you're running a really small engine. Even with a very heavy heat load and high head pressure, it shouldn't take more than 1 or 2 horsepower to cool an area the size of a truck cab. A 5 HP compressor cools my entire house, all 3,000 square feet of it!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!