Schedule a Free Consultation

What Makes Replacement Windows ENERGY STAR® Qualified?

You know you’re purchasing energy-efficient windows if they are ENERGY STAR® qualified. These windows add more protection to your home and help you save on energy costs.

What Makes Replacement Windows Energy Star Qualified

In this post, your trusted local windows contractor, Renewal By Andersen® of St. Louis, discusses what makes windows ENERGY STAR qualified.

Characteristics of an Energy-Efficient Window

Energy-efficient windows have multiple panes with an air- or gas-filled space in the middle. Odorless, colorless and non-toxic gasses like argon and krypton work better than just air in preventing the transfer of energy.

The more panes the windows have, the more energy-efficient and impact resistant they can be if they’re well-made. Spacers keep the glass panes at a safe distance from each other. Non-metallic and metal spacers insulate pane edges, helping reduce heat transfer.

Low-e glass has a special coating that reflects infrared light, retains indoor heat in the winter and keeps hot air outside in the summer. This glass also protects you from harmful ultraviolet (UV) light and helps prevent furniture from fading.

Renewal by Andersen of St. Louis offers ENERGY STAR-rated windows to help reduce your energy costs and improve your home’s appeal. We offer energy-efficient and beautiful bow, picture, double-hung and casement windows.

ENERGY STAR® Framing Materials 

An energy-efficient window has top-quality frame material. Such materials should be low-maintenance and highly insulating.

Fiberglass is a durable and low-maintenance material. Fiberglass frames can be hollow or filled with foam insulation. Vinyl frames excel in thermal insulation, and they may also be hollow or filled with foam insulation.

Aluminum frames are a eco-friendlier option as they are recyclable and usually made of up to 15% recycled materials. Wood frames should be clad with aluminum or vinyl to reduce maintenance. Meanwhile, composite frames are created from different materials mixed together to make low-maintenance and durable windows. Probably the best type is Fibrex®, our proprietary framing material developed by our parent company, Andersen®.

Choose Renewal by Andersen of St. Louis for high-quality windows installation services. Our team also specializes in French and sliding patio doors. Call us at (314) 332-2364, or complete our online form for a free in-home estimate. We help homeowners in St. Charles, MO, and surrounding areas.

Reviews

"Have nothing but great things to say about the window installation done today by John Hutchinson with Renewal by Andersen! He was friendly, personable and professional and did a great job installing. He did a great job of putting down roller pads and tarps with next to zero clean up. Would highly recommend them for any window replacement needed!"

Mark V.
Jun 26, 2025

"We had our new Renewal by Andersen windows installed on June 5th & 6th, 2025 and we LOVE them! The quality, beauty, and functionality are best-in-class! The whole experience from dinner presentation at Lazy River Grill, the initial in-home sales consultation and measurement, the regular communications from the salesman and concierge, and the installation team’s professionalism and skills made the process so seamless. This is the second home we have opted for Renewal windows and doors and have been delighted both times! Thank you Renewal by Andersen STL! "

Jeff C.
Jun 7, 2025

"I had an excellent experience with RbA STL. Our designer, Courtney, was great and the finished product is awesome. The installation was easy and the gentlemen left our home cleaner than they found it upon entering. I would recommend RbA STL - you’ll get tired from their constant contacts, and that’s a GOOD thing!"

Jeramy D
Jun 3, 2025

View All Reviews