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  • Why Windows Matter
    • Save Money
    • Control Comfort
    • Natural Light
    • Cut Condensation
    • Protect Your Art and Furniture
    • Block Street Noise
    • Rebates and Incentives
  • Understanding Windows
    • Types and Parts
    • Window Ratings
    • Window Replacement Options
    • Choosing Windows
  • Additional Resources
    • Standards and Design Guidance
    • Window Buying Guide
    • Energy Rating Systems and Tools
    • Commercial Windows
    • Glossary
    • FAQ
  • Articles
Try the Window Selection Tool
  • Why Windows Matter
    • Save Money
    • Control Comfort
    • Natural Light
    • Cut Condensation
    • Protect Your Art and Furniture
    • Block Street Noise
    • Rebates and Incentives
  • Understanding Windows
    • Types and Parts
    • Window Ratings
    • Window Replacement Options
    • Choosing Windows
  • Additional Resources
    • Standards and Design Guidance
    • Window Buying Guide
    • Energy Rating Systems and Tools
    • Commercial Windows
    • Glossary
    • FAQ
  • Articles
Try the Window Selection Tool

Gas filled windows keep you comfy

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About Us

provides unbiased information and education to the public on the energy efficiency, technical, and human considerations that influence window selection and use. We do not sell, service, install, or recommend products, or endorse manufacturers. Descriptions and specifications of the products in the Window Selection Tool are provided by the manufacturer. NFRC is not liable for any manufacturing defects or inaccurate product descriptions and specifications and does not guarantee the performance of NFRC-certified windows, doors, and skylights.

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National Fenestration Rating Council
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Greenbelt, MD 20770
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