Definitions for "Low-e glass"
Keywords:  radiant, emission, coated, glass, heat
Low-emission glass (Low-E) is a clear glass, it has a microscopically-thin coating of metal oxide. This allows the sun's heat and light to pass trough the glass into the building. At the same time it blocks heat from leaving the room, reducing heat loss considerably.
This glass has an insulating coating which reduces the amount of heat flowing through a window, but does not affect daylight. Low-E glass can bounce back between 40% and 70% of the heat that would otherwise pass through.
Low-emissivity (reflective) coated double glazing