I installed this on my sliding glass patio door. I have a plexiglas panel insert in this door with a doggie-door. It doesn't fit very tight and let lots of cold air in. I put this product over the whole door then taped around the opening for the doggie-door, sealed it good, re-installed the doggie-door, used the hair dryer to smooth out the wrinkles. So far, we have about a 10 degree difference in that area. Looking forward to savings on my heating bill and plan to leave it in place for next summer as well, since I have another access for my backyard. Should be better for my plants sitting in the window, too.
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