With heating costs on the rise, I wanted to do some insulation around my windows using those plastic films that you tape in place then use a blow dryer to shrink out the wrinkles. My friend said he saw a big difference after he did this to his house.
My question is, how important is air gap between the film and the window? I ask because there is not a convenient place to apply the film sheet. My windows are all recessed into the wall. If I tape along the wall, I'll get a nice pocket of air between the window and the film, but I'm afraid that the tape will not stick very securely (b/c the wall has a pebble textureA), and I'll also lose use of the window ledge and blinds, since both would be behind the film. (though the instructions suggest cutting a small hole in the film and threading the blind drawstring through the hole). Also, I just think it's kind of ugly.
My other option is to tape along the metal frame of the window itself. This has appeal because it is unobtrusive (being behind the blinds, and the tape sticks well to the metal, so I can get a good seal. The problem is, the air gap between the sheet and window would be much smaller--between 2in and 1/4in at different points around the window, at some points even touching the window. With such a small gap, will I still get good insulating value, due to the basically air-tight seal of the sheet?
Thanks for your help.
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