Visible Transmittance (VT) is a measure of how much light passes through a window. VTs range from 0 (no light) to 1 (all light). VT is an important quality to consider when purchasing a window because sunlight can fade furniture and carpets or damage precious art. Sunlight can also affect the ambience of a room in your home. A special coating on windows called low-E can provide even better protection against UV rays along with greater insulation. The National Fenestration Rating Council (NFRC) offers reliable VT ratings for windows that they have certified.
Read about other window ratings: U-factor, Low-E, and Solar Heat Gain Coefficient, on ecomii.
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Read more about energy efficient windows at ecomii's Green Building center.
See the NFRC’s website for more on window ratings.
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