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What Makes a Window Energy-Efficient?

Don’t underestimate how much heat is gained or lost through inefficient windows. According to the Department of Energy, heat gain and heat loss through windows account for 25% to 30% of residential heating and cooling costs. As such, an energy-efficient home window replacement is worth the investment if you’re looking to lower your electricity bill.

What makes a window energy-efficient?


Insulative Window Frames

An energy-efficient window frame should be able to block heat transfer that can increase indoor temperatures and by extension the strain on your HVAC system. Fiberglass and wood are commonly used frame materials with good insulative capabilities. Renewal by Andersen®, your trusted window installer and replacement company, also offers an exclusive wood-and-polymer composite called Fibrex®, which has excellent insulative capabilities, minimal maintenance needs and is durable enough to withstand a wide variety of climates.

Energy-Efficient Glass

You can assess a window’s energy-efficiency by checking its U-factor and solar heat gain coefficient (SHGC) value. The lower the U-factor, the better a window’s insulative capabilities. The lower the SHGC, value, the less solar heat that enters your home. For homes in temperate and moderate climates, we recommend choosing a window replacement with a low U-factor and SHGC value. Renewal by Andersen’s most energy-efficient glass option is High-Performance™ Low-E4®, which is 56% and 47% more energy-efficient than an ordinary dual-pane glass pane in summer and winter respectively.

Insulated Glazing

Windows with insulated glazing have an air space sandwiched between their glass panes to regulate heat. This space is then filled with an inert gas (usually argon, krypton, or a mixture of both) to create an insulative barrier.


Here’s a tip: look for windows with the ENERGY STAR® label. Only windows that have met the EPA’s stringent performance standards have this label.

Renewal by Andersen® of Memphis offers the best replacement windows on the market. What makes our windows different from the rest? As part of our Signature Service, we customize each and every window according to our customers’ needs and preferences. To schedule a free consultation, call us at (901) 979-4460 or fill out this form.


"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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