The best insulation over bubble wrap came several years ago when DH bought a 70" TV to celebrate his retirement. He was excited about the TV. I was excited about the foam Mylar wrapping! I cut it apart and it covered 12 ft of the north wall. What's more, the sun reflects off the Mylar to help warm the gh in the day. Added Mylar backed foam insulation boards to the outside held in with bungee cords and that wall with the north exposure is covered well.
