NFRC Window Ratings & Energy Efficiency

Written on: April 1st, 2014 BY IN Windows

If your windows are old and drafty, replacing them with new, energy-efficient ones can be beneficial in a number of ways. Not only will newer windows look better but, more importantly, they can help you save money and live more comfortably. So how can you tell if a window is energy-efficient?

One of the best ways to determine if a window is energy-efficient is to look for ENERGY STAR and National Fenestration Rating Council (NFRC) labels. On our blog, we’ve discussed ENERGY STAR window ratings, and in this post, we’ll talk about NFRC ratings.

About NFRC Window Ratings

The National Fenestration Rating Council

A nonprofit organization that helps consumers purchasing energy-efficient windows, doors and skylights, the National Fenestration Rating Council labels windows on how well they perform. Essentially, when you see the NFRC label, you know a window is energy-efficient. In fact, the energy performance of all ENERGY STAR qualified products need to be independently tested and certified according to test procedures established by the NFRC.

What NFRC Window Ratings Mean

The following performance ratings can be found on the NFRC label:

  • U-Factor measures the rate of heat transfer and tells you how well the window insulates. U-factor values generally range from 0.25 to 1.25—the lower the U-factor, the better the window’s insulating ability.
  • Solar Heat Gain Coefficient (SHGC) measures the fraction of solar energy transmitted and tells you how well the product blocks heat caused by sunlight. SHGC is measured on a scale of 0 to 1—the lower the SHGC, the less solar heat the window transmits.
  • Visible Transmittance (VT) measures the amount of light the window lets through and is measured on a scale of 0 to 1. The higher the VT, the more light you see.
  • Air Leakage (AL) measures the rate at which air passes through joints in the window. AL is measured in cubic feet of air passing through one square foot of window area per minute. The lower the AL value, the less air leakage.
  • Condensation Resistance measures how well the window resists water buildup. It is scored on a scale from 0 to 100—windows with higher condensation resistance factors are less vulnerable to water buildup.

NFRC Label

Learn more by visiting ENERGY STAR or NFRC.

Energy-Efficient Windows in Indianapolis

If you’re looking to install energy-efficient windows for your home in the central Indiana area, we can help. Overhead Door Co. of Indianapolis & Muncie offers ENERGY STAR (and NFRC) labeled vinyl windows from American Window and Great Lakes Window.

Contact us to learn more about our services or if you’re ready to replace your old windows!