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How to Gauge Window Energy Efficiency

Understanding the Energy Label and Ratings

The Okna® Windows we carry at America's Window are designed to be energy efficient. But you don't have to take our word for it. Instead, you can tell how energy efficient they are just by looking at their label. Our windows are Energy Star® certified, which means that they have met and exceeded energy efficient standards set by the government. The blue logo can often be found on the window's NFRC label. The NFRC label is from the National Fenestration Rating Council and exhibits the window's energy efficient qualities on a rated scale. Since not everyone knows what all those numbers mean, America's Window is here to help break it down so you can know exactly what you're getting.

What does it All Mean

The NRFC label shows the ratings for 5 major things, the U-Factor, Solar Heat Gain, Visible Transmittance, and Air Leakage, and Condensation Resistance. Though the ratings for Air Leakage and Condensation Resistance are optional for the manufacturer, they are still worth understanding. Each of these ratings tell you about certain aspects of the replacement window's potential for energy efficiency. That's why understanding how to read them is so important to the process of purchasing new or replacement windows for your Campbellsville home.

  • U-Factor: This indicates what the window's ability is when it comes to retaining heat in your home. If the number is lower, then the window possesses a better insulating value. The range used to measure this is .20 – 1.20.

  • Solar Heat Gain Coefficient (SHGC): This rates the window's ability to block radiant heat which results in heat transfer. This is measured on a scale between 0 and 1 and you want the number to be lower.

  • Air Leakage: Tells you how much air you could lose through the cracks in the window's assembly. The numbers used to rate this fall between .1 and .3. Lower numbers indicate a lower potential for air leakage.

  • Visible Transmittance (VT): Tells you the window's potential for interior illumination with natural lighting. A higher potential is represented with a higher number on a scale between 0 and 1.

Trust America's Window for All Your Window Needs

At America's Window, we'll strive to answer any questions you have about replacement windows or any type of home improvement. Questions about our variety of styles, framing materials, or energy efficiency can all be answered by any of our knowledgeable experts. All you have to do is contact us and we'll be more than happy to assist you during your free consultation. Don't wait any longer to pursue energy efficiency with your Campbellsville home and ask about our energy efficient windows today!


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