![]() Visible Transmittance (VT) - VT measures how much visible light passes through the windows. ![]() Choose windows with low SHGC for maximum natural lighting without increasing the room’s cooling requirements. Solar Heat Gain Coefficient (SHGC) - SHGC measures resistance against heat gain from sunlight. Therefore, a window with a low U-Factor will have a correspondingly high R-Value. Both measure insulation, but R-Value measures heat resistance. Note that some labels indicate R-Value instead of U-Factor. ![]() For better window insulation, look for windows with a lower value. U-Factor - U-Factor measures window insulation, specifically in how well it prevents heat from escaping. The National Fenestration Rating Council (NFRC) affixes these labels after testing the windows for energy performance, specifically in the following areas: ![]() Let us first take a look at the Energy Performance Labels found on new replacement windows. ![]()
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