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Best U-Factor and SHGC Ratings for Windows in Northern Virginia
By @bestwindowinstallationndx537
Why U-Factor And SHGC Matter In A Northern Virginia Climate If you are comparing replacement windows in Northern Virginia, U-factor and SHGC should be at the top of the list. Think of U-factor as the window's resistance to heat loss. A lower rating means the window holds indoor heat more effectively. SHGC, or solar heat gain coefficient, measures how much solar heat gets through the glass. Lower numbers block more sun, which matters a lot on south- and west-facing
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