For our popup, we utilize all of the following strategies as conditions require. Obviously, the tent fabric can lose a LOT of cool air very quickly:
- Radiant barrier under the wing bed mattresses (left in at all times)
- Radiant barrier cut out to fit in every single window opening. It can be installed or removed very quickly between the plastic and the screen. We store the pieces under the wing bed mattresses.
- Reflectors that install over the wing beds and the slideout
- Close curtains to wing beds during heat of day (except during nap time)
- Utilize the 12-volt fans for wing beds and/or dinette area
- Awning to help shade front of camper
- Park in as much shade as possible
I'd highly recommend the reflective tint available at Home Depot or Lowe's for glass windows in a TT or 5er. We use it on our rear storm door at home and it's incredible how much of a difference it has made.
Beyond that, I'll agree with those who advocate a 2nd unit for more cooling. If you're ever in a spot where power is limited, you can just run one and stay under the amp limit.
