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U.S. Department of Energy Energy Efficiency and Renewable Energy

Windows, Doors, and Skylights

Energy-efficient windows, doors, and skylights—also known as fenestration—can help lower a home's heating, cooling, and lighting costs.

Learn about their energy performance ratings and how to maximize their energy efficiency in your home:

  • Exterior Doors

    Select energy-efficient doors or improve the energy efficiency of existing ones.

  • Skylights

    Select energy-efficient skylights.

  • Windows

    Select energy-efficient windows or improve the energy efficiency of existing ones.

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