ENERGY STAR Certified Windows and Patio Doors from Simonton

Homeowners look to the ENERGY STAR® program and its recognizable blue label to identify high-performance, energy-efficient products. Backed by the U.S. Environmental Protection Agency, ENERGY STAR provides guidance on how to save energy, save money, and protect the environment. As an ENERGY STAR partner since 1999, Simonton Windows & Doors is dedicated to meeting the energy-saving standards the EPA has established for windows and patio doors to help lower household expenses, increase comfort and reduce environmental impact.

Energy Tax Credit Information

Learn more about the 2021 Energy Tax Credit extension and download the Simonton Manufacturer’s Certification Statement.

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*Ranges are based on the average savings among homes in modeled cities. Actual savings will vary based on local climate conditions, utility rates, and individual home characteristics.

Why choose ENERGY STAR certified windows and patio doors?

Windows and patio doors play a crucial role in the overall energy efficiency of a home. According to, heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use.  Simonton offers ENERGY STAR glass packages that meet or exceed climate zone requirements across the nation to deliver optimal savings and comfort for wherever you live.

ENERGY STAR Climate Zone Map & Performance Criteria

What are the benefits of ENERGY STAR windows and patio doors?

  • Reduces heating and cooling costs.
  • Enhances your home’s comfort during any season.
  • Protects the environment by using less energy.
  • Shields your home from interior fading with Low-E glass that helps reflect damaging ultraviolet rays.

How are windows and doors ENERGY STAR certified?

Every ENERGY STAR window and door is independently certified to meet or exceed energy performance set by the EPA. These standards are based on National Fenestration Rating Council (NFRC) ratings and vary for different climate zones. The NFRC is a third-party non-profit organization that supports independent testing, certification, and labeling of windows and doors to help you understand and compare energy performance. The NFRC labels provide testing performance for U-Factor, Solar Heat Gain Coefficient, Air Leakage, Visible Transmittance and Condensation.

For windows and doors, ENERGY STAR guidelines measure the U-factor and the Solar Heat Gain Coefficient (SHGC). Energy performance ratings vary for specific climate zones to deliver the best possible energy efficiency for where you live.

The U-factor is commonly described as the amount of heat transferred through a material. The lower the U-factor, the slower the rate of heat flow and the better the insulating quality.

The SHGC refers to how well the product blocks heat caused by sunlight. The lower the number, the greater the product’s ability to reduce the amount of heat absorbed into the home.

How do I know if my window or door is ENERGY STAR certified?

When you purchase a new window or door ask if it meets or exceeds the ENERGY STAR guidelines for your region. Understanding the energy performance numbers will help you select the right glass package to achieve maximum results for your home.  If you’ve already purchased windows, the NFRC label shows the qualified ENERGY STAR regions for your product. You can also go to to look up a window’s performance.

Simonton Most Efficient Products

Select Simonton windows have been awarded ENERGY STAR® Most Efficient for 2021. The Most Efficient distinction identifies products that offer cutting-edge energy efficiency and represents the best performing ENERGY STAR windows available. Learn more at

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