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High Performing Windows or Storm Windows Improving the performance of your windows is an important part of an ENERGY STAR Home Upgrade because it reduces the energy waste associated with a leaky home and improves comfort.

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Lower energy consumption also reduces greenhouse gas emissions from power plants and homes. Thanks to advances in technology, today's ENERGY STAR certified windows , doors, and skylights offer greater savings than ever before. Just look for the correct ENERGY STAR label for where you live.

Your 2026 Guide to ENERGY STAR Windows

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Learn about the energy saving power of ENERGY STAR windows , including yearly cost savings, window ratings and requirements, and more.

Climate zones have different recommended energy -efficient performance levels for windows , doors, and skylights. You can use the NFRC label or the NFRC Certified Products Directory to compare ENERGY STAR products. To find ENERGY STAR windows for your specific climate zone, use our Window Selection Tool.

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Learn how ENERGY STAR -qualified windows can improve indoor comfort while saving money on heating and cooling costs. This fact sheet from Energy Saver includes information on ENERGY STAR standards for windows , replacing old windows , and considerations when purchasing windows .

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PDF Guide to Energy

Guide to Energy -Efficient Windows Replacing your home's windows with ENERGY STAR ® qualified windows will improve indoor comfort and filter out damaging ultraviolet light, while potentially saving you hundreds of dollars a year on heating and cooling costs.

Explore Energy Star approved windows - certification requirements, features and advantages, and an extensive list of which windows qualify.

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ENERGY STAR Window Ratings

Understanding ENERGY STAR window ratings can help you save on energy bills. Learn how U-factor, SHGC, and climate zones affect window performance.

The National Fenestration Rating Council (NFRC) is the trusted, independent, nonprofit certification body for the energy performance of windows , doors, and skylights. NFRC certification ensures that products are tested using precise, scientifically validated methods, resulting in ratings that are fair, accurate and credible.