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The best way to compare the energy efficiency of windows and patio doors is to look at their NFRC (National Fenestration Rating Council)label. Every product has a label applied to the glass with energy performance ratings that have been certified by an NFRC accredited independent testing laboratory.

  1. NFRC certified products – Look for the NFRC logo on the label to be sure the product is certified according to National Fenestration Rating Council requirements.
  2. U-Factor – indicates how well a product prevents heat from escaping.  The lower the number, the better.
  3. Solar Heat Gain Coefficient – measures how well a product blocks heat caused by sunlight. The lower the number, the more it will help reduce the use of air conditioning and as a result reduce electrical bills and energy use.
  4. Visible Transmittance – refers to how much visible light comes through a product.  The higher the number, the more light is transmitted.
  5. ENERGY STAR® – When you see the ENERGY STAR® logo on the NFRC label, you can be certain that the product meets or exceeds ENERGY STAR® performance guidelines in the shaded portions of the map shown on the label.

 

 

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