What is the NFRC?

The NFRC, or National Fenestration Rating Council, is a non-profit organization that takes it upon themselves to help consumers make more informed decisions when purchasing windows, doors, and skylights. The NFRC label is placed on products that has met or exceeded the council’s energy rating standards, which are stringent and designed to determine how well a product will perform in all kinds of weather. To learn more about the NFRC, visit their website at


For replacement windows, carrying the NFRC label is critical. Any window that does not carry the label is not transparent on the ratings for that particular window. And even if a product is energy efficient but does not carry the label, that means that the manufacturer has not taken the time or put in the effort to have their products tested.

Factors listed on the label:

  • U-Factor – The lower the U-Factor, the more efficient the window and door is in colder climates.
  • SHGC – Solar Heat Gain Coefficient shows how well your window and door will stay cool in the summer.
  • Visible Transmittance – This will show how much daylight is able to pass through the window and door.
  • Air Leakage – The optimum performance is 0.3 or below for any window and door.

Each Renewal by Andersen replacement window carries the NFRC label. Andersen has taken the time and put in the effort to design windows that exceed the standards of this renowned organization and perform in an energy efficient manner throughout the seasons.

Get a FREE quote for replacement windows in Maine and New Hampshire

To be certain you are making the best investment in your home, talk to the most trusted experts in replacement windows in Maine. Call Renewal by Andersen of Maine at (207) 985-8465 to schedule a free, no obligation in-home consultation, demonstration and estimate.

Please visit the pages below for more info on our service areas:

66 Industrial Park Road
Saco, ME 04072

Areas We Serve:
Kennebunk | Scarborough | Portland | Biddeford