ThermaTru Doors

Energy Efficiency

More than 80% of Therma-Tru door and glass options are ENERGY STAR qualified and National Fenestration Rating Council (NFRC) certified. ENERGY STAR is a government program that helps consumers save money on energy costs and protect the environment through superior energy efficiency.


Does your Therma-Tru door qualify?

Therma-Tru offers thousands of ENERGY STAR qualified choices. Check the charts below to find out what qualifies.

Find your climate zone.

Whether a door qualifies for ENERGY STAR may depend on where you live. Click on the map to search for climate zones by ZIP code.

Climate Zone Map


ENERGY STAR 2015 Criteria

In an effort to raise the bar for energy-efficient products, ENERGY STAR is changing its criteria for the residential doors category. As a leader in entry and patio doors, Therma-Tru has already adopted the new criteria.

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:




Do you want to know more?

We asked our codes and compliance manager for answers to your questions. Click on a question to go to the answer.

What is ENERGY STAR?
What are the 2015 ENERGY STAR criteria?
Which Therma-Tru products qualify?
What are U-Factor and SHGC?
Where can I go for more information?



  1. What is ENERGY STAR?
    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.
  2. What are the 2015 ENERGY STAR criteria?
    For 2015, the Environmental Protection Agency (EPA) has changed the criteria for ENERGY STAR qualified doors. They did this to improve the energy performance levels, in other words, they made it much more difficult to qualify. Doors must now have a much lower U-Value (also known as U-Factor) and Solar Heat Gain Coefficient before they can earn the ENERGY STAR label. 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 to search by ZIP code.
  3. 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 to find qualified products.

    Here are some of the features that help Therma-Tru doors earn their ENERGY STAR qualified ratings:
    - 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 and privacy glass is triple-paned 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.
  4. 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.
  5. Where can I go for more information?
    You can visit the ENERGY STAR website to learn more about ENERGY STAR qualified products.
Energy Star Partner
#ThermaTru ©2014 Therma-Tru Corp. | All rights reserved.