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Popular in Home Improvement

How to Read a Window Label

Windows come with a label that provides important energy-performance ratings. Learn what each rating means so you can make an informed decision when buying windows.


    Everything in this slideshow

    • NFRC Window Label

      The National Fenestration Rating Council (NFRC) certifies windows and provides energy performance labels that help you determine how well windows are constructed. The information on the label allows you to compare one window to another and make informed decisions about the windows you buy.

      The current label, adopted in 2005, lists the manufacturer, describes the product, provides a source for additional information, and includes ratings for energy performance characteristics. Because the label can be confusing, this slideshow breaks it down and describes what each rating means. So the next time you buy windows, you can do it with confidence.

    • U-Factor

      The U-Factor measures how well a window prevents heat from escaping. The lower the U-Factor, the greater the window's resistance to heat flow and the better its insulating value. U-Factor ratings generally range from .20 to 1.20.

    • Solar Heat Gain Coefficient

      Solar Heat Gain Coefficient (SHGC) measures how well a window blocks radiant heat caused by sunlight. The SHGC is indicated by a number between 0 and 1; the lower a window's SHGC, the less solar heat it transmits into your house.

    • Visible Transmittance

      Visible Transmittance (VT) measures how much visible light is allowed through the window. A higher VT means more light is transmitted. It's expressed as a number between 0 and 1.

    • Air Leakage

      This indicates how much heat loss and gain occur through cracks in the window assembly. The lower the Air Leakage rating, the less air will pass through. This rating is optional, so manufactures may choose not to include it.

    • Condensation Resistance

      Another optional rating, the Condensation Resistance (CR) measures the ability of a window to resist condensation forming on its interior surface. The higher the CR rating, the better the window is at resisting condensation. It's indicated by a number between 0 and 100.

    • C.E.C. Air Infiltration Standards

      C.E.C stands for the California Energy Commission, the state's primary energy policy and planning agency that promotes energy-efficiency through appliance and building standards. If a window meets or exceeds C.E.C. Air Infiltration Standards, the window construction is tight enough to comply with the commission's air leakage standards.

    • WDMA

      WDMA stands for the Window & Door Manufacturers Association. As a trade association, the WDMA defines standards of excellence in the window, door, and skylight industry. It provides resources, education, and professional programs to help industry businesses offer greater value to customers. WDMA members manufacture high-performance products designed and built to meet the association's standards. For more information, visit

    • Hallmark Certified

      The WDMA Hallmark Certification Program provides an easily recognizable means of identifying products that meet the standards set forth by the Window & Door Manufacturers Association. The WDMA Hallmark is considered a mark of excellence among architects and contractors and is accepted industry-wide.

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      Window Design Ideas

      View photos of beautiful windows and learn about window types, sizes, and designs.
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