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What’s the Difference Between ENERGY STAR® and NFRC Ratings?

In this day and age, energy efficiency is very important for many products. Sometimes, it even becomes the selling point of some manufacturers due to the rising energy demands worldwide. Thankfully, there are ways you can distinguish if a product is energy efficient or not. These include the ENERGY STAR® certification labels and energy performance labels from the NFRC.

In this blog, Renewal by Andersen® of Oklahoma, the top manufacturer of energy efficient picture windows, helps you tell the difference between the ENERGY STAR label and NFRC ratings.

Energy Performance Label

The National Fenestration Rating Council (NFRC) is a nonprofit organization that rates fenestrations, windows, skylights, and entry doors. What’s unique about their rating system is that they don’t label products as superior or inferior, but rather by their energy performance. You can see the NFRC ratings on a white label that are divided into four categories:

  • U-Factor. The U-Factor or the U-value measures the product’s insulation and how it prevents heat from escaping a space. The lower the U-factor value, the better its insulating properties are. If a product has a low U-factor, it will have a higher R-value respectively.
  • Solar Heat Gain Coefficient. The SHGC measures your fenestration product’s resistance against heat gain from sunlight. Windows that have Low-E coatings have great SHGC ratings, making it great against heat.
  • Visible Transmittance. This attribute measures how well a product lets natural light through. The higher your transmittance levels are, the more light your product allows through.
  • Air Leakage. This measures how much air can pass through your product. If your product has a low air leakage value, then your product helps prevent drafts.


The ENERGY STAR labeling system makes it easy for consumers to spot energy-efficient products. The certification applies to a wide range of products, such as washing machines, refrigerators, and even computer parts. The ENERGY STAR label is primarily for consumers who aren’t as concerned about specific energy ratings, but rather the product as a whole.

Renewal by Andersen of Oklahoma offers a wide variety of window services, including windows replacement. To schedule a free consultation with our design experts, call us at (918) 921-9211 or fill out this form. We serve homeowners in Oklahoma City, as well as the communities surrounding OKC.


"Our new windows are absolutely wonderful! We were pleased with the entire process and the product and would recommend Renewal by Andersen to anyone."

Mike & Kathy, Edmond| OK
November 5

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