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Another good insulator, foam packing peanuts. We used those to insulate a non used door once, with plastic on the inside to hold the peanuts in place. It was free, we found the peanuts on the university next to the dumpster. It took both 55 gallon bags to insulate the door, but it worked well (it was a mess to clean up, when we left, but great for both summer and winter).
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