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Highly efficient windows with high standards.

Having energy efficient windows is one of the most common reasons people replace their old windows and doors. If you are looking for the most efficient windows then you will want to use ENERGY STAR qualified windows. ENERGY STAR independently tests and certifies energy performance for a number of consumer products, and sets the standard for energy efficient windows across different regions of the United States.


All of the Great Lakes Windows and Doors are manufactured to the strict performance levels set by ENERGY STAR. The ecoSmart windows feature our most efficient products that are built to resist the heat and cold to offer seasonal comfort. In 2018 it was awarded the ENERGY STAR® Most Efficient Mark.


Great Lakes Window meets or exceeds the requirements in all 50 states. In addition, we can exceed requirements for the Northern Zone, by up to 48% with select glass packages. Windows with a low U-Factor and Solar Heat Gain Coefficient rating will help provide comfort all year long while saving on heating and cooling costs.


What makes a window energy efficient?

Below are four common ratings that are provided for windows certified by the National Fenestration Rating Council (NFRC), the American National Standards Institute (ANSI) and the American Architectural Manufacturers Association (AAMA). These are some of the same ratings that are used to certify products.

U-Factor – A measure of the rate of heat flow through a window. The greater a window’s resistance to heat flow the better its insulating properties are. A lower U-Factor indicates a higher performing window that can help reduce heating and cooling costs.

Visible Light Transmittance (VT) – The measure of how much light passes through a window.

Solar Heat Gain Coefficient (SHGC) – The amount of solar radiation allowed to pass through a window. The lower the number, the less solar heat gain the window permits.

Structural-Design Pressure (DP) – The amount of wind pressure a window will withstand when closed and locked.


Technical performance, right on the window.

Every Great Lakes Window and Door is custom made just for you. Our products take into account your specific home’s measurements, and the energy requirements recommended for your area. When your windows are delivered they will each be labeled with an NFRC sticker that shows the certified technical performance ratings of each of your new windows.


Example NFRC sticker that comes on every Great Lakes Window, ensuring your new window is ENERGY STAR qualified


When scheduling your free in-home estimate with a Great Lakes Window dealer, be sure to ask about the ENERGY STAR requirements in your region of the country. Your dealer will be happy to work with you to help you pick the best energy efficient windows to help you save on your heating and cooling costs.

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