Just in the fla keys for a week in our 2015 ACE, parked next to the water, no shade. During middle of the day the a/c was doing all it could but was still warm inside the unit. I have the 15 k unit also. After 3 pm or the hottest part of the day it would cool down, just working all it could in the 95 degree heat with no shade. At night would sleep under covers. My .02
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