SmartGlass365, Worthington Windows & Illinois Energy windows & Siding are Proud To Be Energy Star® Partners.
What Does It Take To Get The Energy Star® Label?

All Energy Star qualifying windows, doors, and skylight are certified by the National Fenestration Rating Council (NFRC). These independent ratings provide the basis for Energy Star’s window performance requirements, which are tailored to fit the energy needs of the country’s different climate regions. You can identify which regions a window qualifies by the map located on the Energy Star label. SmartGlass365 with Quadraseal, helps make Worthington Windows the most energy efficient windows available. You'll enjoy years of low energy costs and windows that dry faster, and cleaner with far less maintenence.

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

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