Reading the NFRC Label

white casement windowsWhen you need replacement windows in Kansas City, be sure to check for the NFRC label before purchasing. Here’s how to look for the label and what it all means.

The NFRC label is an energy rating label from the National Fenestration Rating Council (NFRC.) This label is your way of knowing that the window you are buying has been tested and rated for energy efficiency. The NFRC runs laboratory tests to measure several key factors that affect a window’s performance.

Here are some terms that you may see on the label.

  • U-Factor
    U-factor measures how well a product prevents heat from escaping. The rate of heat loss is indicated in terms of the U-factor (U-value) of a window assembly. U-Factor ratings fall between 0 and 1. The insulating value is indicated by the R-value which is the inverse of the U-value. The lower the U-value, the greater a window’s resistance to heat flow and the better its insulating value.
  • Solar Heat Gain Coefficient
    Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight. The SHGC is the fraction of incident solar radiation admitted through a window and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window’s solar heat gain coefficient, the less solar heat it transmits.
  • Visible Transmittance
    Visible Transmittance (VT) measures how much light comes through a product. The visible transmittance is an optical property that indicates the amount of visible light transmitted. VT is expressed as a number between 0 and 1. The higher the VT, the more light is transmitted.
  • AirLeakage*
    Air Leakage (AL) is indicated by an air leakage rating expressed as the equivalent cubic feet of air passing through a square foot of window area (cfm/sq ft).Heat loss and gain occur by infiltration through cracks in the window assembly. The lower the AL, the less air will pass through cracks in the window assembly.
  • Condensation Resistance*
    Condensation Resistance (CR) measures the ability of a product to resist the formation of condensation on the interior surface of that product. The higher the CR rating, the better that product is at resisting condensation formation. While this rating cannot predict condensation, it can provide a credible method of comparing the potential of various products for condensation formation. CR is expressed as a number between 0 and 100.

Any replacement window worth it’s salt when it comes to energy efficiency will carry this label. At All States Exteriors, we only install replacement windows in Kansas City and the surrounding areas that carry the NFRC label, ensuring that our home owner clients receive the very best in energy efficient windows.

Call All States Exteriors for a FREE Estimate on Energy Efficient Vinyl Windows in Kansas City and Wichita

To learn more about our windows, siding, doors, gutters, decks and roofing, call us at (316) 444-1220 in Wichita and (913) 800-5211 in Kansas City. Fill out our convenient request an estimate form, or stop by either of our local showrooms to schedule a free, no obligation consultation.

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