Q. What is "low-e" in windows?
A: The term "low-e" refers to a coating or thin, nearly invisible film on window glass that lowers the emissivity or radiated heat through the window. The result is a cooler glass surface and a reduction in the transfer of heat into the living space, making it more comfortable and the home more energy efficient.
Low-e glass is now standard on most windows or an easy upgrade on others.