One of the best upgrades you can make to a popup camper is to install Reflectix. For less than $100 and fifteen minutes of your time, you’ll stay warmer on cold nights and cooler on hot summer days.
The Reflectix product is essentially polyethylene bubble wrap encased in reflective aluminum foil. The bubbles provide both air space insulation and strength to support the reflective foil surface. You’ll want the double reflective version to keep the warm air in and the cold air out (or vice versa). By cutting several Reflectix pieces to fit between the screen and canvas in the windows of your slide-out bunk, you’ll upgrade from a thin and drafty canvas to an amazingly well-insulated sleeping setup.
As you can see above, the aluminum foil surface also does a great job of reflecting sun rays to help keep your camper cool during hot summer days. This also helps our kids sleep in a bit later since the bright sun doesn’t wake them up as easily.
And the canvas can still be unzipped a bit for letting in some breeze.
All of this really helps conserve battery power when boondocking since your furnace fan won’t need to run as often.
And when you’re done camping, simply slide the Reflectix panels under your mattress for convenient storage (making sure they are dry, of course).
From the exterior, you can hardly tell the product is installed.