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What does the U-Factor of an EcoShield vinyl window mean?

April 26, 2017ecoshield mean u-factor vinyl window

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What does the U-Factor of an EcoShield vinyl window mean?

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The U-Factor measures the rate at which heat transfers and is an indicator of how well a window insulates. The lower the U-Factor the better the window insulates. According to Energy Star, U-Factor values generally range from 0.25 to 1.25.