ENERGY STAR Windows and Doors

As an ENERGY STAR partner, Simonton® Windows & Doors is committed to meeting the strict criteria of the U.S. Environmental Protection Agency to help conserve energy and reduce heating and cooling costs for all our customers. When you purchase Simonton vinyl windows and doors that meet ENERGY STAR® guidelines, you know you’ll have optimum energy efficiency and comfort for wherever you live. That’s why Simonton has developed ENERGY STAR glass packages for each climate zone. Select the glass package custom made for your region, and you’ll be assured of the right combination of components to deliver impressive year-round thermal performance.

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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Window and Door Criteria

2016 ENERGY STAR CriteriaIf you’d like to learn more about ENERGY STAR Qualification Criteria for Residential Windows, Doors and Skylights, click to view the 2015 and 2016 requirements.

Why Buy ENERGY STAR windows and doors?

Heating and Cooling Costs

Purchasing ENERGY STAR windows can help you save money on heating and cooling throughout the year.

Get Comfortable

ENERGY STAR windows can help create a consistent temperature throughout the house season after season.

Reduce Your Carbon Footprint

With ENERGY STAR qualified windows and doors, you will use less energy, which reduces greenhouse gas emissions from power plants.

Protect Your Furniture and Floors from Fading

ENERGY STAR windows have a special Low E coating on the glass that’s like a sunscreen for your house that helps block damaging UV rays from fading your floors, photos, and rugs.


How does ENERGY STAR measure its criteria?

By measuring four different parts of the window: the glass, the gas, the spacer and the reinforcement. The combination of these factors influences the unit’s U-value and solar heat gain, both of which are drivers for meeting ENERGY STAR performance level. By adjusting any one or more of these four factors allows us to meet the new ENERGY STAR criteria.


To be labeled as an ENERGY STAR product, the U-factor and SHGC (Solar Heat Gain Coefficient) ratings must be less than or equal to those established by ENERGY STAR.

  • U-value The U-value or 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 value.
  • Solar Heat Gain Coefficient (SHGC) The SHGC refers to the amount of heat from the sun that windows and doors allow into the home. The lower the number, the greater the ability to reduce the amount of heat absorbed into the home.

Learn more about the ENERGY STAR program visit their website at

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