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.

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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Better Window Insulation An Envirosealed window or door with the Duralite insulating glass spacer is designed to trap air inside small, sealed chambers, which act as insulating pillows of air that reduce energy loss. This can reduce energy costs and improve the energy efficiency of a window by as much as 10 percent.
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