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Window Seals: Why They Are Important, How To Fix Them
Posted on Wednesday, August 13th 2025

Window seals. When it comes to the upkeep of your home, they might be something you never think about — until cold weather sets in and it starts getting a little drafty inside. Window seals can be found in modern windows, which often have double or triple panes of glass. Compared to older windows with one pane of glass, manufacturers insert air or an inert gas, such as argon, between these multiple layers before sealing up everything with an elastic sealant. These windows are known as insulated windows, thermal windows, thermopanes, or IGUs (insulated glass units).

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