Glass unit LOW-E

Energy - saving glasses get their name from a special optical low - emission (or energy - saving) coating that is applied to the surface of ordinary transparent glass to increase its energy - saving properties. This layer lets infrared radiation (direct solar heating rays) into the room, while simultaneously "mirroring" long heat waves (for example, heat from heated radiators). In other words, energy - saving glass lets in solar heat into the room, but does not release heat from heated objects outside, returning it back.