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ENERGY PERFORMANCE RATINGS: READING THE NFRC LABEL

When choosing replacement windows, the small National Fenestration Rating Council (NFRC) label contains a big message to help you make an informed decision. You should know how to read it properly to determine the most suitable ENERGY STAR®-approved units for your home.

Energy Performance Ratings Reading The Nfrc Label

In today’s post, Renewal by Andersen® of St. Louis talks more about the ratings on the NFRC label:

U-Factor

This measures how well energy-efficient windows prevent heat from transferring from the inside of the room to the outside. Expressed in a range between 0.20 and 1.20, the lower the value, the better the unit is at insulating thermal energy.

Solar Heat Gain Coefficient (SHGC)

This measures how much solar radiation the unit allows inside. Expressed in a range of 0 to 1, the lower the value, the better the window is at reflecting the sun’s infrared light.

All windows installation experts agree that every climate zone demands a unique combination of U-factor and SHGC. In St. Charles County, the maximum U-factor and SHGC ratings every window must have are 0.30 and 0.40, respectively.

Visible Transmittance (VT)

This measures how much daylighting the window provides. Expressed in a range between 0 and 1, the higher the VT value, the more sunshine it allows to pass through the glass.

Air Leakage

This measures how well the window prevents air infiltration. Expressed in a range of 0.1 to 0.3, the lower the number, the less drafty it is. By and large, casement windows are the most leak-resistant of all operating units because their sash presses against the frame when closed.

Condensation Resistance

This measures how much moisture the window allows to accumulate on its surface. Expressed in a range between 0 and 100, the lower the value, the less condensation you’ll see. While this rating is generally optional, it’s imperative to keep it in mind when choosing your new windows.

Renewal by Andersen of St. Louis windows have the best combination of ratings to meet and exceed ENERGY STAR’s standards. Call us at (314) 310-3636 to schedule your consultation, learn more our high-performance products and receive a FREE estimate. We serve St. Charles and other Missouri communities.

Reviews

"Scheduled for December, Installed in October, High quality windows and Excellent install team. I haven't seen people work together like that in years. I am definitely impressed."

Raymond Mills
Oct 13, 2022

"The service provided by Renewal by Anderson is great, both on the sales and the installation side. Our sales representative was very accommodating and helpful. The installation crew was efficient and they all were professional. These are really nice windows and a great upgrade especially from builder-grade windows."

Brad Allen
Nov 17, 2022

"It is great to do business with a company that still cares about what they do and respects the end goals. We appreciate your craftsmanship professionalism, and cannot say enough about the wonderful experience. It was clear from the onset of the installation we got the A Team and we certainly appreciate that."

1speedwagon
Nov 17, 2022

"Everyone I worked with from setting up the initial appointment to the salesman to the installers to everyone who checked on us and kept us updated on the progress of the windows was courteous, professional, and responsive. There’s always someone who is willing to answer your question without jumping through hoops which is rare these days! The installers were on time, did a beautiful job, cleaned up the space better than I expected, and even helped me with some blinds I couldn’t remove and fixed my squeaky front door! I’ve already recommended Renewal by Anderson to friends!"

Karen Mortillaro
Nov 19, 2022

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