About ENERGY STAR Door and Window Ratings

window ratings

To set a regulated door and window ratings system in place, there are several government councils and programs that control the ratings and how energy-efficient windows and doors are rated.

Windows and doors that display these ratings and follow these nationally set guidelines undergo a series of test and perform according to strict rules. Look for these trusted recommendations.

Who is the NFRC?

The NFRC, or the National Fenestration Rating Council, is a program set up by the U.S. Department of Energy (DOE). The NFRC was established to assist you in comparing windows and doors and generally be a guide in your decision process.

Manufacturers are not required to participate in this program, but for those who do, the information they provide is very helpful for consumers. The NFRC necessitates that every item is clearly labeled with its specific thermal performance level.

In order to earn this label, manufacturers must enlist third-party inspectors to rate their products, so many companies choose not to go this route, simply to save on overall costs. Those who do, though, go above and beyond and the label gives you additional piece of mind that you are purchasing quality products.


The U.S. Department of Energy and Environmental Protection Agency, or the EPA, has a program called ENERGY STAR to help and encourage products with great energy efficiency. These products not only save you money, but also help protect the environment.

Products that are labeled with the ENERGY STAR seal meet very specific standards when it comes to their U-Value and Solar Heat Gain Co-Efficient ratings. These windows and doors are rated based on glass type, frame material and design of the product.

ENERGY STAR door and window ratings labels can only be applied to windows and doors which have undergone and passed testing done in accordance with NFRC regulations and standards as mentioned above.

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