A few years ago we camped in our TT in Delaware and it was near 100 degrees. We turned on the 13.5 A/C while we were setting up camp, and over the first couple hours it did not seem to work at all in lowering the temperature inside. We figured it was broke. So we left it on and went to the beach for a few hours. When we got back the sun had gone down, and the TT was freezing cold inside. Even longer than a car, it takes a long while to chill a TT that had been baking in the sun for hours. Once you get it cooled off, it shouldn't be a problem keeping it cool.
