If you have a digital thermostat, most can be adjusted to turn on the A/C when the temperature rises 1 or 2 degrees rather than the 4 degree swing (2 over and 2 under that they are normally set for.) This helps a lot in keeping the coach at one temp rather than getting too hot and then too cool. The only other good, cheap fix it to try to park it in the shade. When choosing a campground or site in the summer, shade is always one of the things I look for.
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