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Understanding Solar Heat Gain Coefficient

Preventing excessive heat gain is one of the primary tasks of high-performance windows and glazed doors. Renewal by Andersen® of Memphis, however, admits that not all fenestration products can do this job efficiently. To identify which ones can prevent most of the sun’s infrared light from entering your house, pay attention to Solar Heat Gain Coefficient (SHGC).

Understanding Solar Heat Gain Coefficient

What Is It?

SHGC measures a product’s ability to resist solar heat gain. It ranges from 0 and 1, any reputable window and door replacement specialist would advise you to go with a lower number.

Most of the sun’s light passes through the glass, but the National Fenestration Rating Council (NFRC) focuses on the entire unit. This non-profit also takes the heat transmittance occurring through the frame into account to come up with a more accurate rating.

What Is Ideal in Our Climate?

In Shelby County, the maximum SHGC to look for in replacement windows is 0.25. To successfully meet ENERGY STAR®’s requirements for the South-Central Climate Zone, though, Renewal by Andersen of Memphis recommends taking note of the U-factor too. Your chosen units must also have a U-factor of 0.30 or less for excellent energy efficiency.

When it comes to glazed doors with over 50% glass, the combination to look for is 0.30 U-factor (or less) and 0.25 SHGC (or less).

Why Choose Renewal by Andersen Products?

Renewal by Andersen of Memphis products bear the ENERGY STAR label, which indicates satisfactory energy ratings. Our standard High-Performance™ Low-E4® glass allows only 42% of the solar heat through while having a U-factor of 0.25. To reduce heat gain further, we recommend our High-Performance Low-E4 SmartSun™ glass, which only lets 28% of solar heat and has a U-factor of 0.24.

Made with Fibrex® material, our products do not expand and contract as much as most vinyl replacement windows due to extreme temperature fluctuations. The rigid frames of our windows render them weathertight for decades and therefore more reliable and energy-efficient over time.

To learn more about our made-to-order products and start-to-finish service, call (901) 779-1178 to schedule your free no-obligation consultation with us.


"Absolutely wonderful experience working with renewal. They kept my wife and I up to date all throughout the process from the initial sales pitch to installation. They were courteous and professional throughout. The installation of 8 windows was completed in one day and the product is fantastic. Immediate difference felt inside the home and its much quieter now too. My wife and I are thrilled at our purchase. The windows are a bit pricey but worth every single penny. Wonderful product from a wonderful company. Will definitely be using them in the future to install the rest of the windows in our home."

Joseph Sipes
Jul 16, 2022

"When I say, superior service I mean just that!! From start to finish I was pleased!! Step 1, Scheduled appointment at the Home show… easy. Step 2, phone call to confirm appointment the next week….easy. Step 3, in home consultation with Keith Billingsley…..Amazing!!!! Step 4, call and cancel all other Window companies and let them know you have chosen the Best company, Anderson Windows!!! My Windows took a couple of months to come which was not a problem. Oooohhh but when installing day came ( a week early) I was lost for words. The installation team was A1 with professionalism and cleanliness!! They didn’t leave a scrap of trash on my property. It was cleaned up both days. I had Ed Tutton and crew. I had a million questions and they answered every one of them and made me feel so assured with the process. A couple of my Windows had wood rotted. They took care of it and fixed it better than when the house was built!!! Two of my Windows came in broken, it was addressed and shown to us and reorder in the same day!! They will be installed later. The Windows are so beautiful I stood in my master bedroom Windows for almost 3 hours just looking out. I hate Window grates…. I have solid glass Windows now❤️❤️! I wish I would have ordered my new front doors from Anderson Windows. So if you are looking to get new Windows you must go with Anderson Windows!!!"

Celeste Ousley
Jul 13, 2022

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