What is Low-E Glass? Low-E glass is normal glass that has a microscopic metallic layer embedded into it, which basically acts as a heat reflector. This layer is invisible to the human eye, and is usually on one of the inside surfaces in a 'double-pane' or 'thermo-pane' unit. Low-E glass helps to insulate your home by keeping your heat in during the winter, and keeping the heat out during the summer. Low-E is the main reason that new windows can help save you money on your energy bills. Low-E is a term that stands for "Low Emissivity". Low Emissivity says that the substance in question, in this case glass of course, allows only a small portion of energy through. A substance that allows energy from the sun, or heat from your furnace to pass right through, would be said to have a high emissivity. The better that substance insulates from this energy transfer, the lower the emissivity. The following was taken from the Efficient Windows Collaborative: "Low-emittance (Low-E) coatings are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a window or skylight glazing surface primarily to reduce the U-factor by suppressing radiative heat flow. The principal mechanism of heat transfer in multilayer glazing is thermal radiation from a warm pane of glass to a cooler pane. Coating a glass surface with a low-emittance material and facing that coating into the gap between the glass layers blocks a significant amount of this radiant heat transfer, thus lowering the total heat flow through the window. Low-E coatings are transparent to visible light. Different types of Low-E coatings have been designed to allow for high solar gain, moderate solar gain, or low solar gain." You can find out more about Low-E glass through our supplier, AFG, or at the Efficient Windows Collaborative. Low-E glass is commonly combined with inert gas fills that act as an invisible blanket to prevent losing heat through conduction and convection between two pieces of glass. Argon and Krypton are the common gas fills in use. For more information, please contact us.

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