Understanding Air Leakage for Replacement Windows: The Importance of a Low Score and How This Affects Your Home

Understanding Air Leakage for Replacement Windows

One of the major performance rating categories that is usually (but not always) listed on an NFRC label is Air Leakage. This measurement is sometimes referred to as “air infiltration” and measures the amount of exterior air that will pass through a window and into a home. In general, most air infiltration happens through gaps and cracks in the outside shell of a window. However, poor insulation around windows, doors, and vents can also contribute to air leakage. Because air leakage is one of the leading causes of poor energy efficiency, most home energy audits will begin with an air infiltration test.

Calculating the air leakage of a window is actually a bit complex because it takes into account both square and cubic measurements as well as wind speed. The unit of measure used to calculate air infiltration is “cubic feet per minute per square foot.” In other words, an air leakage rating tells us: how many cubic feet of air is able to pass through a window in one minute with the wind blowing at a constant speed of 25 mph divided by the total area of the window—simple, right?

All you really need to know is the lower the air leakage rating, the less air will be able to pass through the window. In order for a window to receive an ENERGY STAR® rating, it must have an air leakage rating of 0.30 or lower. While the existing windows on many homes can have air leakage ratings of 0.50 or higher, Sunrise offers high-performing replacement windows with air leakage ratings as low as 0.02 to help keep your home as airtight as possible.

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For more information about how a replacement window’s air leakage rating can affect your home’s energy performance, click here to locate a Sunrise Windows dealer in your area.

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As a window salesman who can sell Pella, Marvin, and Andersen windows as well, I can say with confidence that the Sunrise Window is a better option than any of those window brands. Most of the negative reviews I have read about the Sunrise product, is because the homeowner is uneducated on how condensation works, or the fault of the installer. If Sunrise makes a mistake, they will always fix it. Best window company to deal with and best warranty out there.

I purchased Sunrise Windows last year for a house I was flipping. I believe the windows were a big reason the house sold for nearly 100% of the asking price. This is a great company. I would recommend this company's products to anyone.

Toledo, OH

I had Sunrise Windows installed in my home in 2000. We started noticing some of the wood lament on the windows started peeling. Sixteen years later, Sunrise honored their warranty and replaced every window. This is a stand-up company.

Temperance, MI

I had ALL my windows and both doors replaced at the same time to my older (built in 1958) home by the folks at Sunrise and am very satisfied with the selection, service and installation! I’d recommend Sunrise to anyone renovating their older home.

Installed 30 replacement windows and 2 sliding glass doors in Raleigh, NC. No leaks, no condensation, nearly perfect inside and out. Some windows were larger than 5x5 and still no problems. No more drafts and lower hvac costs. Real quality. Check with experts who engineer glass, as I did. They look great and visitors actually notice and comment. Just a happy customer. Nice job guys!

Raleigh, NC

A company that honors their warranty! I had their windows since 1996 and the company still honors my warranty. Great windows. Great company. Thank you Sunrise!

Chicago, IL