All I can add is that the BEST temperature drop we've been able to get is 20 degrees (on a 114 degree day) and that's with double layer mylar coated bubble insulation in all the windows, awning out for shade, plugs in every vent, and all doors closed. We've also converted all lighting to LED, and use as little as possible. This is with a single 15k btu air conditioner. Add a second without blocking every possible way for heat to get in and you won't even get that much. There's only so much insulation manufacturers can put in a one to two inch thick wall or ceiling.