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Online and off, most home improvement stores stock plastic shrink film insulation kits. The longstanding favorite even sells on Amazon.com (and at a steep discount). Like other similar products, the 3M Indoor Window Insulator Kit includes all you need to apply insulating film over as many as five standard windows. Double-sided tape holds the film in place until the last step in the quick and easy installation process, when you use a hair dryer to shrink the film in order to achieve an air-tight seal.
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