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

Purchasing energy-efficient windows will help you save on energy costs and improve your home’s overall comfort. There are two labels that you should look out for when you’re looking to purchase windows or sliding patio doors: the National Fenestration Rating Council® (NFRC), and ENERGY STAR® labels.

Whats The Difference Between Energy Star And Nfrc Ratings

NFRC® vs. ENERGY STAR®

The NFRC is a third-party non-profit organization that serves as the industry-recognized certifying body for windows and doors. They aim to help consumers compare the performance of doors, windows and skylights. However, the labels do not directly reflect whether a product is bad or good, but they set minimum performance standards or mandate performance levels.

ENERGY STAR ratings act as a supplement to NFRC labels. ENERGY STAR tests windows, skylights and doors in accordance with the standards set by the NFRC. All ENERGY STAR-labeled products have also met stringent energy efficiency requirements set by the U.S. government

NFRC Performance Ratings

Solar heat gain coefficient (SHGC): The SHGC refers to the amount of solar radiation a window or door allows inside. Those who are situated in warmer areas should opt for windows or patio doors with a low SHGC rating while those living in cooler areas should go for a higher rating.

U-Factor: The U-factor is an indicator of a unit’s rate of heat transfer and insulation performance. The lower the number, the better an insulator the window or door is.

Air leakage (AL): AL rating refers to the amount of air that passes through the joints of a door or window. The lower the air leakage rating, the more airtight the unit is. This number is measured in cubic feet per minute per square foot of window or door area. However, this rating isn’t considered as much for ENERGY STAR due to external factors, such as frame materials expanding or warping. It’s still an important metric nonetheless especially if you live in an area with harsh weather.

Condensation resistance: This number indicates how well a window withstands water or moisture buildup. The higher the number, the better the resistance.

Visible transmittance (VT): This rating refers to the amount of light a window or skylight lets through. The higher the VT rating, the more light enters your home. Through advancements in glass technology, this doesn’t let as much heat enter despite the amount of light passing through into your home.

Do you need energy-efficient windows and French doors? Check out our selection at Renewal by Andersen® of St. Louis! Call us at (314) 983-9977, or fill out our contact form for a FREE estimate! We serve St. Louis and the rest of Missouri!

Reviews

"This was one of the best experiences I've ever had with a company. I ordered the windows in November and was told they wouldn't be here until July. That kind of delay the new norm so I wasn't a bit upset with the timeline. I was given an early present when they called to say the windows would be in at the beginning of May. We agreed on the week of May 16th to do the installation, there were 30 windows and a sliding door to install. They arrived promptly on their scheduled install date, and got straight to work. By the end of day one, they had all the upstairs windows complete and their work was incredible. Day two came with more of the same, the crew showed up promptly, got straight to work, and when they left they had every window downstairs installed. The third day they again arrived on-time, and got to work installing the door. The door and windows are perfectly installed. The two lads that did the installation did a phenomenal job, and were friendly to boot. I would give them more business if I had any :) The service I received from the company was great. They kept me abreast of anything that was going on with my order. I appreciate my concierge, Christina, she was good at communicating timelines and getting everything scheduled."

Lane Maxwell
Jun 28, 2022

"The two installers were great! They were polite and hard working and they cleaned up all the outside and inside. It was like they were never here. As for the windows, I love them, not only looks great, they are efficient. Now every window in my home has Renewal by Anderson."

Mark Palsgrove
Jun 23, 2022

"We had the pleasure recently of having Andersen replace all of our windows. From the very first interaction with the office personnel through the completion of the project, they have been nothing but professional. From Brian our sales rep to Christina the appointment scheduler, they were a pleasure to interact with. Installers Keith, John, and Evan were fantastic to work with. They went above and beyond to repair an area which was slightly damaged during the removal of a window...caulked and painted it. They took extra precaution to ensure the floors were covered while working inside and cleaned up each day inside and out. We love the look of our new windows and can't wait to enjoy the savings in utilities they'll provide. Thanks so much Renewal by Andersen!!"

Kevin Corrigan
Jun 15, 2022

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