For those that do not have the snap on outside sun screens I can say that they make a huge difference in how much heat gets into the coach. They are a pain to attach because a ladder is needed, but they are effective.

The privacy shades emit heat. As Ed says once the heat gets past the windshield in the form of solar energy the entire front of the coach gets very warm. Too bad we cannot leave the sun screens on while driving in a southerly direction. I cannot imagine how hot an H3 gets with that tall expanse of glass.