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| Windows made with high performance warm–edge spacers stay warmer when it is cold outside. And the warmer the glass edge, the less energy lost. A warm edge spacer also enhances your comfort zone inside by keeping extreme elements outside – where they belong. A high performance window also reduces condensation on the glass when it's cold outside. The best warm–edge insulating glass spacer–namely, the Duralite® window spacer – can improve a window's total U–value by up to 10 percent. A U–value, also called the overall heat transfer coefficient, measures how well a building element conducts heat. Duralite also keeps argon gas inside the window, which is a good thing: Argon gas improves a window's insulating properties and keeps moisture out. Moisture fogs a window and ruins the view.
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