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What is more important R-Value or U-Factor?

April 26, 2017R-Value u-factor

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What is more important R-Value or U-Factor?

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R-Value stands for thermal resistance and is typically measured in the center of the glass only. R-Value does not measure the window units overall efficiency. U-Factor is a more important factor when evaluating energy efficiency. You shouldnt consider a window with a U-Factor over a .22.