Of course those units used Freon 12, which the tree huggers managed to get banned by lying about its so-called environmental hazards. R-134 is not as efficient, and does a lousy job of cooling at idle and low compressor speed. Out on the road, it works pretty well.
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!