The metal around the interior of the Windows was getting very hot from the sun, and the Windows were radiating a lot of heat. As a test, we put the bunk mattresses against the wall in the bunk room covering the Windows. The bunk room typically was 2F hotter than the middle area. During the test day with the mattresses, the temp in the bunk room was 2F cooler than the middle... A 4 degree swing. I think after all of the Windows (especially the big ones in the middle area) are treated with heat film, it will make a big difference.