When it comes to entryways, energy efficiency is all about the door materials, glass and components, and how they work together.

Now through Dec. 31, 2021, you may be eligible to claim a one-time tax credit of up to $500 on the purchase price of a new ENERGY STAR® qualified exterior Therma-Tru® door. Purchases from 2018 and 2019 may also qualify. 

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ENERGY STAR is a government program that helps consumers save money on energy costs and protect the environment through superior energy efficiency. As part of our commitment to offering quality products that excel at helping your home save energy, we proactively adopt standards that meet or exceed ENERGY STAR criteria.

More than 80% of Therma-Tru door and glass options are ENERGY STAR qualified and National Fenestration Rating Council (NFRC) certified. That means energy savings straight in your pocket.

Some of the features that help Therma-Tru doors earn their ENERGY STAR qualified ratings include:

  • A polyurethane foam core: Therma-Tru fiberglass doors have a solid polyurethane foam core which is among the most energy-efficient door materials available today.

  • Energy-efficient glass: Most Therma-Tru decorative, as well as privacy and textured, glass is triple-pane for reduced heat flow. Factory-coated Low-E glass options deliver exceptional energy efficiency.

  • Complete door systems: Therma-Tru doors and glass are engineered to work together with components like weatherstrip that help create a tighter seal and reduce air leakage around the edges.

View ENERGY STAR rated products

View Manufacturer’s Certification Statement for Energy Tax Credit (PDF)



ENERGY STAR is a voluntary program that was created by the EPA and is administered by the EPA and U.S. Department of Energy. Its goal is to help reduce the energy consumption and help consumers protect the environment. By being ENERGY STAR qualified, your Therma-Tru door is held to one of the highest standards in the country for energy efficiency.

What are the 2015 ENERGY STAR criteria?

In 2015, the Environmental Protection Agency (EPA) updated the criteria for ENERGY STAR qualified doors. They did this to improve the energy performance levels, in other words, making the criteria much more stringent and difficult to satisfy. Doors must now have a much lower U-Value (also known as U-Factor, see below) and Solar Heat Gain Coefficient before they can earn the ENERGY STAR label.

To be labeled as an ENERGY STAR qualified product, the NFRC ratings (U-Factor and SHGC or Solar Heat Gain Coefficient) ratings must meet the 2015 ENERGY STAR Eligibility Criteria for residential doors:

Glazing LevelU-Factor1SHGC2
Opaque ≤ 0.17 No Rating
≤ ½-lite ≤ 0.25 ≤ 0.25
> ½-lite ≤ 0.30 Northern
≤ 0.40
≤ 0.25
  • Air Leakage for Sliding Doors ≤ 0.3 cfm/ft²
  • Air Leakage for Swinging Doors ≤ 0.5 cfm/ft²
  1. Btu/h ft² °F
  2. Solar Heat Gain Coefficient

Under the new criteria, it may also depend on where you live. For doors with larger glass, the U-Value and the Solar Heat Gain Coefficient needed to qualify change depending on whether you live in the Northern or Southern part of the country. See the ENERGY STAR Climate Zones Map to search by ZIP code.

Which Therma-Tru products qualify?

Because of their design and construction, more than 80% of Therma-Tru door and glass options qualify for the ENERGY STAR program. There are thousands of choices for entry and patio. See the ENERGY STAR Qualification Charts below to find qualified products.

What are U-Factor and SHGC?

A U-Value (also known as U-Factor) measures how much heat or cold passes through the window or the door. It basically tells you how well a door or window insulates the home. The Solar Heat Gain Coefficient tells you how much heat from the sun is able to pass through the glass of the door or window.

Where can I go for more information?

Visit the ENERGY STAR website to learn more about ENERGY STAR qualified products.