ENERGY STAR helps you meet and exceed energy-efficient standards to make your building or renovation purchases easier and long-lasting. Learn how you can save money, energy and the environment with a simple window replacement.

Conductivity and Condensation in Windows In some windows, the spacer in the window frame can be conductive, allowing energy to escape, so valuable heat energy is lost through the window. When Envirosealed windows and doors with non-metallic Duralite insulating glass spacers are used, the glass edge is up to 45 percent better insulated against energy loss, creating a higher performance thermal barrier and the lowest U-value available.
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EnergyCore EnergyCore™ is an innovative, patent-pending window system with Fusion Insulated Technology™ that offers superior thermal performance and greater energy savings.
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