When on the road we use Magna Shade, it has really helped to keep the heat out. If you want to help keep it a little cooler when in storage, then I use Reflective Roll Insulation. You can get it at Lowes or I'm sure on Amazon. I cut it to fit all my windows so it fits in the tracks to keep it tight to the windows. You can also cut it to fit the windshield. This will help to keep the damaging rays from the sun out and helps keep it cooler. I also have the Maxxair vent covers so I can keep my vents open even when it rains. I have the little window at the sink open to help keep the air circulating and that will also help keep the MH from getting mildew. I only use my Magna Shade when I'm on a trip, but I do keep the Reflective Insulation on the back window and also on the windows by the couch and dinette when traveling.
Dave, U.S.A.F. (Ret)
2019 Fleetwood Discovery LXE 40M (Big D)
2016 Ford Focus, flat tow