Lowemissivity Coatings

A large proportion of the heat loss and gain through a window is due to radiation — a process where warmer objects radiate heat to cooler objects, as in the case of the sun warming the earth with its radiant energy. A low-

emissivity (Low-E) coating is a thin metallic film deposited on glass which acts as a mirror to radiant heat, reflecting it back into the dwelling during cold weather, and back to the outdoors during hot weather. Low-emissivity coatings work to reduce heating and cooling bills. They provide a double-glazed window with about the same performance as a clear, triple-glazed window, but at less additional cost. An increasing proportion of window manufacturers are offering Low-E glazings as a standard feature due to their improved resistance to condensation on the inside glazing during cold weather.

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