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Posted on Nov 25, 2016 by Sam Heer

Understanding Energy-Efficient Windows

Energy-efficient windows help you cut back on energy costs. Nevertheless, before you contact us for a replacement, here are a few facts about energy-efficient windows.

What are Energy-Efficient Windows?

These windows are made of materials with a higher insulating value that allows them to preserve heat. Several panes of efficient glass make up each window. An insulating gas is filled in the spaces between the panes to help reduce the transmission of heat around the house. Given the local climate, our windows at Renewal by Andersen® of Central Illinois are effective as replacement windows in Decatur, IL, and in the surrounding areas.

What Should You Consider?

Different factors make up a window’s energy value. Be sure you understand the measurements used by the National Fenestration Rating Council. The U-factor is the rate of heat loss of a window. A window with a lower U-factor is more appropriate for colder climates and vice versa. The Solar Heat Gain Coefficient, on the other hand, measures the amount of heat that passes through. Air leakage indicates the chances of drafts happening; a higher number means the window is more likely to be drafty. Condensation resistance is responsible for the condensing of water in multiple window glazes. The visible light transmittance, similar to sunglasses, determines the amount of visible light that passes through your windows. The higher the number means less visible light.

In choosing replacement windows in Springfield, IL, they should have the ENERGY STAR® label that lets you know what climate zones the product is certified for. Another is the white NFRC label, the industry-recognized certifying body for windows and doors.

At Renewal by Andersen® of Central Illinois, we use High-Performance™ Low-E4® glass, for our windows. Each glass is more energy-efficient in summer and in winter. Our Fibrex® material also adds to energy efficiency, as it has superior thermal insulating properties. In addition, it does not require painting and reduces cracking. These two features make sure that our windows meet the industry standards in terms of energy efficiency.

For variety of options on energy-efficient windows in Springfield, IL, call us today at (866) 693-6707. You can also fill out our contact form for a free estimate.


"I would recommend RBA of Central Illinois for QUALITY windows and doors. Compared to our old cheap, thin vinyl windows, Andersen blows them away. You can easily tell by how well the sliding doors fit and close, and how heavy duty they are. We also cannot hear the wind rushing through the house in inclement weather anymore! And the black window frames we went with are amazing to look at. Aaron, Al, Darrell, and Cory all were professional and went all out to finish the job, given the weather they had to deal with. I would definitely recommend. They were also on top of communicating with me given the weather delays, and what I could expect for them coming out. Five stars!"

Eric L.

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