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How to Choose Energy-Efficient Windows

It pays to invest in energy-efficient window replacement products. High-quality windows will improve your home’s comfort and protection against harsh conditions as well as reduce your heating and cooling costs.

Here’s how to choose the most energy-efficient windows for your home. 

ENERGY STAR® Label and Rating

Choose products with an ENERGY STAR® label when looking for energy-efficient products. ENERGY STAR assesses the energy efficiency of windows through two performance ratings, the U-factor and solar heat gain coefficient (SHGC). 

U-factor refers to the amount of non-solar heat that escapes from your home through the window. The lower the U-factor, the more energy-efficient a window is. SGHC is a measurement of how much solar heat can pass through the window. If your casement windows have a lower SHGC, they can block unwanted solar heat gain more effectively. It’s also important to choose windows that are suitable for your climate. 

The Right Frame Material

The window frame material has a big impact on the energy efficiency of the unit. Frames come in various materials including aluminum, vinyl and composite. Each has a different heat transfer rating. Renewal by Andersen® windows are made of Fibrex®, a composite material that combines the strength and insulating value of wood with the low maintenance features of vinyl. This material will not require repainting and will not crack, pit or corrode. 

High-Performance Glazing

You can get significant energy savings when you choose a window glass that was specifically designed to meet the demands of your local climate. Look for a glazing with a special gas fill, heat-absorbing tint and low-E coating. Gas fills are typically either argon or krypton and occupy the space between glass panes. Low-E coatings can reduce energy loss by 30 to 50 percent. 

Whether you’re replacing a casement or double hung window, you can rely on Renewal by Andersen® of San Antonio. We offer some of the most energy-efficient windows and doors in the industry. Call us at (210) 888-9680 or fill out our online form to schedule a free consultation. We work with homeowners in Bulverde and Schertz, TX. 


"When we purchased 10 large windows from Renewal by Anderson, were able to do so because of the liberal finance plan offered. The work was done in a timely manner and they did a good cleanup. I would highly recommend them for any window replacement."

Valerie Faleski

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