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How to choose energy-efficient windows for your home

Aug 26, 2016

mom and baby in window

Everyone wants to save money, but when you can conserve cash by conserving energy, it’s a win-win proposition. Energy-efficient windows prevent outdoor air and temperatures from seeping into your home’s interior, providing energy savings as well as a boost in your comfort.

Before investing in replacement windows, get to know what the technology provides. Knowing how to choose the energy-efficient windows for your home ensures you get the results you expect.

Energy Performance Ratings

The National Fenestration Rating Council (NFRC) certifies the energy performance of windows, skylights, and glazed doors. They assess the heat gain and loss that occurs, and provide a rating, based on two measurements:

  1. U-value: The window’s resistant to heat loss; and
  2. Solar Heat Gain Coefficient (SHGC): The amount of heat the enters the home through the glass

The lower the NFRC rating, the better the energy efficiency of the window.

Window Frame Material

Your choice of window frame material could impact the energy efficiency of the replacement window.

Vinyl windows are more affordable than wood and also provide excellent energy efficiency with low maintenance.

Wood offers the best insulation of any replacement windows, but also requires more maintenance. Because of the potential for rot, wood is best in dry climates.

Wood-clad windows represent a hybrid approach. The vinyl exterior provides durability with low maintenance. The wood interior adds excellent insulation.

If you’re interested in the engineering that goes into energy-efficient windows, here’s a comprehensive guide from the U.S. Department of Energy.

In the Kansas City area, talk to us at Johnson County Siding & Windows. For 30 years, we’ve specialized in high-performance, low-maintenances windows. Contact us to learn more about your options for energy-efficient replacement windows.


If you know you want to get your home exterior project done, but are feeling stress about paying for it all at once, we can help.

Our financing partner, GreenSky, has sensible payment plans that work for homeowners who prefer to pay in installments. You can also ask your JoCo Siding & Window Co. sales representative about the details!

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Johnson County Siding & Window Co.
"Working with Johnson County Siding & Windows was a pleasure. They delivered high quality work swiftly for a reasonable price and were respectful of my home. Highly recommend Johnson County Siding & Windows for window replacement!”

- David D.
Johnson County Siding & Window Co.
"Everyone associated with the company was professional and respectful. Our windows look great, communication was very good, and the time line was manageable. Would recommend!”

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Johnson County Siding & Window Co.
"We are impressed with the quality of the work and we are very pleased with the value after comparing to other options. The crew that did the siding was absolutely awesome. And we are thrilled with the James Hardie Color Plus Siding for the low maintenance from here on out! Thank you to everyone at Johnson County Siding & Window from their sales person to their lead manager and to the crew!”

- Sharon M.

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Serving the Kansas City Metro Area, Including Olathe, Overland Park, and Leawood See a Full List of the Cities We Serve
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