Replacement windows come with information about their energy performance ratings. These are helpful when shopping around for new windows, allowing you to compare two products to determine which one can best contribute to your home’s energy efficiency. One of the ratings to look for is the solar heat gain coefficient (SHGC). Read on as we explain more about it.
Understanding SHGC Ratings
The SHGC rating quantifies the amount of solar radiation entering a building through a window. This radiation contributes significantly to the heating or cooling needed in a home. Solar heat gain can be a benefit or a drawback depending on the window.
A window with a higher SHGC rating absorbs more heat from the sun, which might be ideal during winter. However, during the hot summer season, a lower SHGC rating would be preferable to reduce cooling costs.
Factors Influencing SHGC Ratings
The best SHGC rating for your new windows is dependent on several factors, including the following:
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Type of Glass. Various glass types have different qualities. The solar heat gain of window glass depends on its thickness, coating, tinting, and composition. Certain coatings lower SHGC, reflecting more sunlight and cooling the indoor living areas.
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Window Frame Material. Window frame material can also influence the SHGC. Diverse materials possess different heat retention or deflection characteristics.
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Use of Low-E Coatings. Low-E (low-emissivity) coatings applied to window surfaces are designed to reflect more sunlight and thus reduce solar heat gain. These coatings are instrumental in altering the window’s SHGC.
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Window Orientation. Window placement or orientation also impacts SHGC ratings. Windows facing certain directions may receive different amounts of sunlight depending on the time of day and the season.
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Climate and Location. The SHGC suitable for a home can depend on your climate. A lower SHGC would work better to reduce heat gain if your home is in a warmer region. Conversely, cooler climates can benefit from a higher SHGC.
Trust Us for All Your Window Needs
If you’re ready to explore your window options or want to know more about SHGC ratings, contact Renewal by Andersen® of Kansas City at (913) 956-0887 or fill out our online form to schedule a consultation. We serve clients in Olathe and the surrounding communities.
