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How Efficient Are Energy-Efficient Windows?

Renewal by Andersen® of Seattle windows have been delivering unparalleled energy efficiency for decades. Our window replacement units meet the strict standards of ENERGY STAR® and have excellent NFRC ratings. In addition, their state-of-the-art features have earned us the prestigious Green Seal certification. Here’s what makes our products so energy-efficient:

Low-E Coating

For true energy efficiency, choose replacement windows with low-emissivity glass. Featuring layers of metallic oxides that reduce the harmful effects of UV rays, windows with low-E glass help regulate radiant heat as it enters and leaves a room.

Our windows have high-performance Low-E4® SmartSun™ glass, which provides incredible benefits for heating, cooling, daylighting and UV protection. It is up to 70% more energy-efficient in the summer and up to 47% in the winter than ordinary dual-panel glass. It also blocks up to 95% of harmful UV rays, which are responsible for making your home feel hot.

Fibrex® Frames

Our Fibrex frames feature excellent insulation and durability. Fibrex has superior thermal insulating properties that improve the comfort in your home by blocking thermal transfer up to 700 times better than aluminum, thus reducing your energy bills. Its stability and rigidity are on par with wood.

In addition, Fibrex combines the beautiful look of wood with the low maintenance nature of vinyl. Plus, Fibrex will not crack, pit, corrode or rot like wood or vinyl, which helps prevent energy leaks. Renewal by Andersen® of Seattle casement windows also come with Fibrex material frames.

Argon Gas Blend

We fill the air space between the dual glass panels with an insulating argon gas blend. This creates a thermal barrier between your home and the outside world. We use our own insulating gas blend in all our windows and doors.

Our whole window performance process provides your home with superior energy efficiency. It involves superior framing material, energy-efficient glass and a quality window installation.

Renewal by Andersen of Seattle offers a wide range of energy-efficient window styles, including double-hung, casement, sliding, bow and bay windows. We serve homeowners in Seattle, WA, and nearby areas. Call (206) 686-7733 today to schedule your free in-home consultation and estimate.


"We were very pleased with the process. Our windows are beautiful, and we are very happy we made the decision to choose Renewal by Andersen."

Tom | Seattle, WA
November 10

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