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  The National Fenestration Rating Council (NFRC) energy performance label can help you determine how well a product will perform the functions of helping to cool your building in the summer and warm your building in the winter.

The NFRC label appears on all products certified to the NFRC standards and on all window, door, and skylight products which are part of the ENERGY STAR® program. NFRC labels on window units give ratings for U-factor, Solar Heat Gain Coefficient (SHGC), Visible Light Transmittance (VT).

Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat from the sun. SHGC is expressed as a number between 0 and 1. The lower the SHGC, the better a product is at blocking unwanted heat gain. SHGC is particularly important in southern climates.
 


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  XO WINDOWS  U-Factor measures how well a product prevents heat from escaping a home or building. U-Factor ratings generally fall between 0.20 and 1.20. The lower the U-Factor, the better a product is at keeping heat in. U-Factor is particularly important in northern climates.  

  XO WINDOWS  Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat from the sun. SHGC is expressed as a number between 0 and 1. The lower the SHGC, the better a product is at blocking unwanted heat gain. SHGC is particularly important in southern climates.  

  XO WINDOWS  Visible Transmittance (VT) measures how much light comes through a product. VT is expressed as a number between 0 and 1. The higher the VT, the more light that comes through the product.  

  XO WINDOWS  Air Leakage (AL) measures how much outside air comes into a home or building through a product. AL rates typically fall between 0.1 and 0.3. The lower the AL, the better a product is at keeping air out. Air leakage is an optional rating, and manufacturers can choose not to include it on their labels.  


  • LowE: an upgraded glass 
    • An impressive scientific advancement in solar control glass is LowE, a tinted version of our finest insulating glass that controls glare, blocks excessive solar gains, and maintains proven year around comfort.
  • How it works 
    • Regular glass works by absorbing sunlight and it gets hot. LowE is a coating that is applied to clear glass to improve performance. It blocks visible light for glare control, reflects invisible solar heat and, because it has a low-emittance coating, the glass stays comfortable all year long – cool in the summer, warm in the winter.
  • A glass for all seasons 
    • This advanced coating design also provides a low U-factor to deliver energy savings and comfort during cold winter weather. Year-round thermal comfort is a result of warm glass temperatures in the winter, cool glass temperatures in the summer, and the blockage of oppressive solar heat gains.
  • What’s your vision? 
    • If you envision your home benefiting from a "tinted" glass for glare control, LowE offers a great combination of aesthetic appeal along with energy performance and in-home comfort.

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