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Energy Savings

EnergyStar Partner GreenSpec Listed The Greener Choice

With Thermal Window & Doors’ high-performance window technology, you have a proven solution to resist the sun’s heat in the summer and welcome it in the winter. Energy-efficient Thermal Windows are engineered to accommodate almost any budget, providing the highest levels of year-round comfort and energy savings, making them well-suited for virtually any climate zone.

Energy Efficient Glass Options

Thermal Windows & Doors is proud to manufacture vinyl replacement windows and doors with the ENERGY STAR® label. Every ENERGY STAR qualified window is independently certified by the National Fenestration Ratings Council, or NFRC, to perform at or above strict levels set by the U.S. Department of Energy. The rating gives you the tools needed to compare window performance.

Peak PerformanceTM Glass

Our Peak Performance Glass system is a dual-pane insulating glass system that combines one lite of high performance Low-E Glass and one lite of clear glass. The air space between the two is enhanced with Argon, an insulating gas. Consider the Peak Performance Eco Glass system, which combines one lite of high-performance triple coat Low-E Glass and one lite of clear glass, for climates where solar control is important.

U-Factor comparison chart

U-Value = 0.29*

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Peak PerformanceTM Ultra Glass

Peak Performance Ultra Glass combines triple glazing, Low-E Glass and Argon gas to offer an insulating value that exceeds ENERGY STAR criteria.

U-Factor comparison chart

U-Value = 0.22*

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Peak PerformanceTM Elite Glass

The addition of Krypton gas for optimal insulation gives our Peak Performance Elite Glass system an exceptional U-factor which far exceeds ENERGY STAR criteria and Department of Energy R-5 criteria (the lower the U-factor, the better a window insulates).

GreenSpec Listed

U-Factor comparison chart

U-Value = 0.18*

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*Note: U-Values published above are from NFRC Certified Products Directory for Thermal Windows & Doors 7000 Series Double Hung Window. Numbers represent U-Values for the total window unit inclusive of frame, sash and glass.

NFRC Certification

What Makes Our Windows and Patio Doors Energy Efficient?

NFRC logoThermal Windows & Doors is a participant in the National Fenestration Rating Council’s Certification Program – a uniform national rating system for energy performance of fenestration products. All Thermal Windows & Doors products are NFRC tested, certified and labeled.
Our Low-E glass boasts up to eight layers of microscopic coatings that act like a filter. In summer, the Low-E glass allows ample visible light to pass through while blocking infrared and ultraviolet radiant solar energy. The result? Rooms stay cooler. In winter, the glass helps to keep rooms warmer by reflecting heat back into the home while letting warm, solar rays in.
Our warm-edge, insulating glass sealant systems flex with the glass in hot or cold temperatures to help prevent sealant failure. These insulating spacer systems keep the edges of the glass warmer, dramatically reducing condensation while keeping warm air in and cold air out. Insulating gases, such as argon or krypton, are used in our double and triple pane window and door products.

ENERGY STAR Qualified Windows and Doors Partner

EnergyStar logoThermal Windows & Doors is proud to be an ENERGY STAR® Partner and offer our customers vinyl replacement windows and sliding glass patio doors with the ENERGY STAR label. ENERGY STAR is the symbol for energy efficiency. ENERGY STAR qualified windows and doors save you energy and money, increase the comfort of your home, and protect your valuable possessions from sun damage. They are also better for the environment because lowering your energy use means less air pollution from power plants, and a greener environment for everyone.
We offer a variety of high-performance, insulating glass systems that qualify our products for the ENERGY STAR label.