Windows term
Low-E Glass
Definition: Low-E glass, short for low-emissivity glass, has an ultra-thin, nearly invisible metal or metal-oxide coating that cuts the radiant heat passing through the window while still letting daylight in.
Why it matters
In an Anne Arundel County home, a Low-E coating helps hold furnace heat in during winter and, depending on the coating, can block much of the sun’s heat in summer, which helps a home with replacement windows cost less to heat and cool. The right coating depends on the product and climate, and its effect is reported as the U-factor and solar heat gain coefficient on the NFRC label.
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