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Our previous coach was a 40’ Tuscany with two rooftop ACs. Even on 90+ days with the dash AC and one rooftop AC running (usually the back) the whole coach stayed nice and chilly. I’m really curious why three ACs and dash running you can’t keep temps down.
If you get a lot of heat in the the rear of the coach I would suspect the insulation around your engine compartment is bad or maybe missing altogether, this would generate a lot of heat in the coach and make cooling difficult. Since your AC cools the coach when parked and the engine off I suspect this may be a large part of your problem, certainly worth checking out.
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