I used a Carrier 15K btu heat pump in my last trailer instead of a traditional a/c. 19' living quarters with zero wall or ceiling insulation and it kept up no matter how hot it got outside. Plus you have the added bonus of full 15k heat as well if you need it. Your rv dealer is going overkill to tell you 50 amp is needed for a single a/c even if it is 15k, 30 amp is plenty. We had one event every year that we ran on 200' of 12 gauge cord on a 15amp outlet and did fine. Of course you have to remember to shut off the a/c to run the microwave etc. in an extreme situation like that.
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