What are Low-E (Low-emittance) Coatings –are microscopically thin, virtually invisible, metal or metallic oxide layers deposited on a 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.
Argon gas replaces the air inside the glass unit. Since it is heavier than air and is not in continuous motion like air, the transference of heat and cold (convection) is greatly reduced. In essence, the Argon gas provides extra insulation.
Energy Star – Low E and argon are available on all our windows and doors, and this qualifies them to receive the energy star rating and tax credit. The energy star tax credit program provides tax credits up to $500 and expires 12/31/2007.