Associations & Affiliations

Low-E Glass
Microscopically thin, virtually invisible metal or metallic oxide layers deposited on the glass in a window. Low-E coatings reduce the heat transfer between the layers of glass. The more coatings of Low-E makes the glass more efficient.

Argon Gas
An inert, non-toxic gas used to insulate windows in order to reduce heat transfer.

Winter U-Factor
This represents the heat flow rate through a window expressed in BTU/hr/ft2/˚F, using winter weather conditions of 0˚F outside and 70˚ inside. The smaller the number, the better the window system is at reducing heat loss.

Solar Heat Gain Coefficient
The amount of solar radiation that enters a building as heat. The lower the number, the better the glazing is at preventing solar gain.

The amount of ultraviolet light that transfers into a building causing damage to furniture, wall covering, floor coverings. Also increases utility bills. The lower the UV Rating, the better.

National Fenestration Rating Council (NFRC)
Independent third-party certification of window energy performance. NFRC U-Factors and Solar Heat Gain Coefficient values are the basis for Energy Star® Labeling of window products.

SmartGlass365 is available on Custom Shield Elite Wood Windows and Worthington Windows by Illinois Energy Windows & Siding.

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