Energy Star
NFRC Certified
Sun Windows
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Sun Windows: An Energy Star Partner
Energy Star® for Windows & Doors
The Energy Star windows program is a voluntary partnership between the U.S. Department of Energy (DOE) and the fenestration industry to promote sales of energy efficient windows, doors and skylights. Energy Star is raising consumer awareness of the benefits of energy efficiency when purchasing fenestration products, and provides practical information to assist them in making informed buying decisions.
Sun Windows, Inc. is an Energy Star Partner. This partnership gives Sun customers the assurance that it provides energy efficient products. All Sun Windows that meet Energy Star / NFRC qualifications are labeled with the Energy Star label. This label helps consumers quickly and easily identify windows and doors that save energy. Look for the Energy Star label on qualified products.
By choosing Energy Star labeled windows and doors you can cut your heating and cooling costs, help make your home more comfortable and reduce air pollution all at the same time. Not a bad deal. In fact, your investment in Energy Star qualifying windows will pay for itself over time, and then the savings is money in the bank every year. And, you will be doing your part to help the environment at the same time.
Energy Star labeled windows are twice as efficient as the average windows produced just ten years ago. That means a home with Energy Star windows will cost a lot less to heat and cool than the same home with ten-year-old windows.
For more information visit the Energy Star web site www.energystar.gov
Also see:
Sun's Performance Ratings
Sun's Certifications page
Sun's Energy Efficiency page
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NFRC - National Fenestration Rating Council
All Energy Star windows must be NFRC rated, certified and labeled for U-factor, Solar Heat Gain, Visible Light Transmittance, and Air Leakage.
National Fenestration Rating Council (NFRC) is a non-profit, public/private organization created by the window, door and skylight industry. It is comprised of manufacturers, suppliers, builders, architects and designers, specifiers, code officials, utilities and government agencies. NFRC's primary goal is to provide accurate information to measure and compare the energy performance of window, door, or skylight products.
Rating System
NFRC has established a voluntary national energy performance rating and labeling system for fenestration products.

The NFRC label rates:
- U-factor, or how well a window keeps heat inside a building.
- Solar heat gain, or a window's ability to block warming caused by sunlight.
- Visible light transmittance, or how much light gets through a product.
- Air leakage, or heat loss and gain by infiltration through cracks in the window assembly.
For more information visit the NFRC web site www.nfrc.org
Also see:
Sun's Performance Ratings
Sun's Certifications page
Sun's Energy Efficiency page
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