Sealing drafty windows is the best way to keep warm air in and cold air out, and doing so can save you up to 20% on your heating costs. A low-tech way of identifying window drafts is the incense test: hold an incense stick near the window edges, and if the smoke wavers, you have cold air entering your home. A more high-tech method to measure drafts is with an infrared thermal device, which uses a laser to measure temperatures from a distance. Popular models of these compact and easy-to-use devices include the Kintrex IRT0421 and the Black & Decker TLD100. Window Insulation Kits A quick and very inexpensive way to seal a drafty window is to use a window insulation kit. These kits trap cold air by covering the entire window with a transparent sheet of shrink-wrap plastic. The sheet is held in place with double-sided tape affixed to the window frame. Window insulation kits are installed at the onset of winter and removed in the spring. Caulking A more permanent method of eliminating drafts is by caulkin ...

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