Understanding Energy Star Labels on Replacement Windows in Hinsdale

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Get 10% OFF Your Installation NOW

Valid for residential installed sales only. Coupon applies to new proposals only. Cannot be combined with any other offers. Contracts must be signed by June 30th, 2024 for the coupon to be valid.

Energy efficient replacement windows are becoming increasingly popular. More and more homeowners in Hinsdale have replaced their inefficient old windows with modern, efficient windows that will reduce the transfer of heat, thus cutting their monthly energy costs and reducing a lot of outside noise. But it should be noted that not all energy-efficient windows are made the same. You should opt for those that meet or exceed the efficiency standards, such as those set by the National Fenestration Rating Council (NFRC) and Energy Rating system.

If you are thinking of replacing any of your old windows in your home, paying attention to the Energy Star label will offer a great deal of information concerning the window you are buying. However, you will only benefit from such information if you could understand the terms that are being used. This guide will help you to understand the common terms associated with the Energy Star label so you can know precisely what you are looking for when it is time to replace your old windows in your home.


U-factor simply measures the rate of heat loss. Since it’s a measure of heat loss through the window, the less the U-Value, the more efficient the window will perform. In other words, the lower the U-factor, the more insulation properties it provides.

Solar Heat Gain Coefficient (SHGC)

The Solar Heat Gain Coefficient is the percentage of solar heat passed through a window. This measures how a window prevents heat from the sun from getting into your home. SHGC is normally identified as a number between 0 and 1. The lower a window’s Solar Heat Gain Coefficient, the less solar heat it transfers.

Visible Transmittance (VT)

The Visible Transmittance is also known as VT is a visual property that shows the amount of visible light that gets through the window. While VT typically varies between 0 and 1, in most cases the values are between 0.3 and 0.8. The lower the VT, the less light is transmitted through the window.

Air Leakage (AL)

AL is a measure of the amount of air passing through fissures or cracks in the window. The higher the AL, the more air will pass over cracks in the window. It is advisable to select a replacement window that has a low AL. Windows with a higher AL rating will permit the conditioned air from inside your home to escape out of the house. This will make the window less energy efficient.

Now that you are aware of the Energy Star ratings and what they stand for, it is also vitally important to consider the overall performance of the window itself. By learning the different types of replacement windows that will offer the most efficiency in your house, you will be able to make an informed decision based on the qualities mentioned above.

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