What is Low-E Glass & Does It Make Windows Energy Efficient?
Low-E, low-emissivity, glass was created to reduce the amount of infrared (IR) and ultraviolet light (UV) that comes through your glass, without minimizing transmission of light that enters your home. Heat and/or light absorbed by glass is either converted away by moving air or reradiated by the glass surface, i.e. Low-E coating.
Low-E windows have a microscopically thin coating, that is even thinner than a human hair! The low-e coating keeps temperatures in your home consistent by reflecting the interior temperature back inside.