I have one ac in my 37 ft trailer and 2 weeks ago temps in 100-105 I could maintain 80 in full sun except for the one day we took the dog out for a walk and came back and I thought the ac was in a cycle but it actually blew the breaker by the time I got it back on it was too late trailer got to 86 and could not get it down lower until evening. I only have single pane windows and I hung heavy each towels over all the window in the sun to help keep the heat out. It worked pretty good but it was very ugly visually.