One 15,000 btu A/C works ok in FL if you are parked under a tree with 95 F ambient. If we are in full sun parked (Moab, UT) we pulled the big slide in and kept a 22 degree temp difference during the day. If we are traveling and it is really hot we start the genset about an hour before stopping for the night to cool down the rear of the coach. Not having to sling that 50 amp cord around is worth being warm for a couple evenings a year.
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