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Works great. Here is the trick. Don't unfold the plastic sheet; just figure out which side is the edge. Then tape the windows and peel the tape so the tape is all exposed. While still folded, cut a piece long enough to have a couple extra inches of the plastic sheet on both sides of the window. Take the whole thing and stick the side that is the edge of the sheet to the tape across the top of the window. Now all you have to do is pull it down to the bottom of the window. Pull the sheet down tight and stick the bottom and sides. It takes me less then five minutes to do a window and I don't even need to shrink the film because there are no wrinkles in it. Make sure you stick it to the top of the window straight, or make sure you have enough extra that if your crooked it will still land on the tape at the bottom on the sides.
At the end of winter I will take them down, fold and store them for reuse next year. If you don't shrink them or at least if you cut them a bit large you can use them several times. You just need to buy a roll of the tape.
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