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The Difference Between NFRC and ENERGY STAR® Labels

When you’re canvassing for new sliding patio doors or windows, you most likely have encountered the distinct ENERGY STAR® label. A product with the ENERGY STAR label imprinted on it means that it adheres to the stringent performance standards set forth by the Environmental Protection Agency (EPA) and the U.S. Department of Energy (DOE). In some cases, you may also notice the National Fenestration Rating Council Label (NFRC).


In today’s post, Renewal by Andersen® of New Jersey explains the difference between the two labels and how they help you as a homeowner.


The ENERGY STAR label indicates that a product is energy-efficient based on the set criteria from the EPA and the DOE. First, it has to be manufactured by an ENERGY STAR partner. Next, it should be independently tested, certified, and verified by the NFRC. Lastly, the NFRC ratings are used to determine whether or not the product meets the energy-efficiency guidelines from the EPA.

The NFRC Label

The NFRC label serves as a helpful guide for customers to compare energy-efficient fenestrations. This label can be found along with any ENERGY STAR-certified products such as windows and French doors. The product’s performance ratings are displayed through these ratings:

  • Solar Heat Gain Coefficient (SHGC): Your product’s SHGC measures the amount of solar transmission and how well your product blocks UV radiation. The values range from 0.25 to 0.80, and the lower the value is, the less heat the product transmits into your home.

  • U-Factor. The U-factor determines the rate of heat transfer occurring in your windows and doors as well as its insulation value. The values are rated from 0.25 to 1.25 and a lower U-factor value signifies better insulation.

Other variables that the NFRC measures include air leakage, visible transmittance and condensation resistance.

Searching for energy-efficient doors and windows? Look no further than Renewal by Andersen of New Jersey! We’re your source for the best replacement windows in New Jersey and Metro New York. Call us at (908) 497-1020 or fill out our contact form to book a virtual consultation. We serve clients in Hillsborough and the rest of New Jersey.


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