So here's a little info from this last weekend. I'm not knocking anybody who likes skylights and "natural light", BUT, here's proof that what I do works. Both of my skylights are insulated / deleted as seen in the mods. 6 out of the 9 windows in the RV are covered in reflectix. The outside temp of 100 deg was read under the awning in the shade between 14:00 and 15:00 (Clock was not set right in the picture, AND, that's between 2-3 pm for those that don't use the 24 hr time clock). The RV itself was exposed to full sun as seen in the picture. Heat index was around 110 deg. Temp setting on the coleman electronic thermostat was 73 deg, and yes, the inside temp maintained 73 deg. The sensor inside was placed near center of the RV, and in a place where it was NOT being hit by the air off of a register, as that would give a false reading. This is a 15k single coleman unit on a 33' rig. So, yes, it is possible to keep cool, if you play your cards right. Our last 40' rig with 4 slides would maintain 70 deg in the same temps with 2 AC's, with a few mods. Think twice before you want that natural light, as natural radiant heat comes with it, especially in the southern states.