Low E means ‘low emissivity.’ The main difference between a Low E glass and an ordinary glass is that Low E glass has a very thin coating applied to one side of the glass. This enables the transport of heat through the glass to be reduced. EnergyTech™ and ComfortPlus™ are all examples of a Low E glass. The main benefits of using such a glass are that more warmth is kept within the room, more space can be used within the room as cold downdraughts are minimised, more window area can be used, heating costs are reduced and the contribution the products make in reducing greenhouse emissions.