I live in Texas and was down in the Kerrville area a couple weeks ago when it was 104-108 the entire 5 days. I thought the trailer did a very good job in the heat. The air would cycle off if set at 81 just using the main air. If I turned the second air on the temp would get down in the mid 70's easily. The only time I used both airs was after we had been gone all day and wanted to cool it off in a hurry. I do have covers(textiline) for the windows that I use for such occasions. These along with the dual panes help.