Hey guys. So, all of my snakes, excluding Nyx and Isis, are in glass tanks. In my new place I'm having a really hard time keeping high ambient temps because of my rooms vaulted ceilings. What materials are best for insulating the sides, and where would I get them?

Also, which is better to put over the screen covers, foil, or plastic wrap? I don't really care about the fact that you can see through plastic wrap, that's what the front of the tank is for But do either materials offer more pros, or does it just not matter if you're not interested in aesthetic reasons?