have you ever run the a/c systems on the 15amp adapter? if so being under powered might have burned up the compressor,rear a/c check the air filter and check the roof top unit condensor/evaporator make sure they are clean and not plugged up, If you have to replace them I would go with one with a heat pump I use my motor home in the winter and run the heat pumps off the generator as the engine heat wont warm anything past the drivers seat.
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