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Solar Heat Gain Coefficient: What It Is and Why It’s Important

Choosing replacement windows involves more than just thinking about which styles would best suit your home’s design. You also need to consider other important factors like durability and energy-efficiency. You need high-quality, durable windows that can keep your home safe from harsh weather. That doesn’t just include strong winds, rainstorms and snow, but also excessive heat that comes from the sun. 

Solar Heat Gain Coefficient: What It Is and Why It’s Important

Solar Heat Gain Coefficient Explained

Simply put, the solar heat gain coefficient (SHGC) is the amount of solar radiation that passes through a window. The fewer infrared rays that pass through your doors and windows, the better.  Infrared rays from the sun that penetrate your home cause passive heating. To compensate, your HVAC system has to work harder to maintain a comfortable indoor temperature, leading to higher energy bills.

How SHGC Is Measured

Generally, a low SHGC is ideal. But how is it measured? You can calculate the SHGC value by multiplying the window’s shading coefficient or SC by 0.87. Shading coefficient is what the window industry used before they changed to SHGC. It tells you the thermal performance of a window’s glass. 

Fortunately, you don’t have to measure for SHGC in windows yourself, as most manufacturers display all the information about window ratings on labels on replacement units.

Why Is It Important to Know About SHGC?

The temperature in your home is affected by SHGC. Since SHGC determines how much heat from the sun enters your home through a window,  this value gives you an idea as to how much passive heating can be expected in your property. A low SHGC is particularly helpful during the summer months or in areas that see a lot of sun. 

What Are the SHGC Requirements in Texas?

Texas requires that windows, skylights and glazed doors have a maximum of 0.25 SHGC if you are part of climate zones 2 and 3 and a maximum of 0.40 if you are in climate zone 4. When you invest in replacement windows and doors as part of your home improvement project, make sure that you consider the SHGC requirements in your area. 

Renewal By Andersen® of Dallas and Ft. Worth can help you with your window replacement. We will make sure that you get the highest quality, most energy-efficient windows with SHGC values that comply with the requirements in Texas. To learn more about window ratings, just give us a call today at (877) 605-2922. We install doors and windows in Fort Worth, TX, and nearby areas.

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"Everything from sales through the installation the process went smoothly! If we had questions or concerns with the installation, they crew always made sure we were satisfied with their answers. The windows look great!"

Kent & Vanessa, Lewisville, TX
April 22

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