Energy efficiency and thermal performance for door glass

Oct. 19, 2017 | by Keith Juhola

The front door can be the focal point of your home’s exterior. However, it can also become the focal point of your energy bill if it is responsible for too much heat loss or gain.

The U.S. Department of Energy identifies direct conduction and radiation as two ways that doors can lose or gain heat. The thermal performance of a door is determined by its resistance to these properties, which can be measured and rated by the following:

  • The rate at which a door conducts non-solar heat flow is known as the U-factor (or U-value). The less heat flow through a door, the lower its U-factor value. 
  • The fraction of solar radiation admitted through the door is known as Solar Heat Gain Coefficient (SHGC). The less solar heat a door transmits, the lower its SHGC.

When making buying decisions, it’s important to look for glass options that have a low U-factor and SHGC value to help maximize the thermal performance of your door. ODL door glass is an easy solution.  When combined with the proper door, ODL door glass can be used to meet NAHB National Green Building Standard specifications. For easy shopping, take a look at ODL’s Thermal Performance Database Tool to search the National Fenestration Rating Council’s Certified Products Directory, which contains filters to help narrow results by size, function, manufacturer, door glass type and type of Low-E glass.

This blog was developed by ODL. All posts, sponsored and un-sponsored have been reviewed and approved by the Sustainable Community Media Editorial Team to ensure quality, relevance/usefulness and objectivity.


Topics: Doors, Windows

Companies: ODL



Keith Juhola
Keith Juhola is Vice President of Sales and Marketing at ODL Inc., a Zeeland, Michigan-based manufacturer of door glass, tubular skylights, door blinds, retractable screens and other entryway products. He oversees sales, marketing and customer service for its USA distribution business. A salesperson and sales manager for more than 25 years, Juhola has worked for both distributors and manufacturers in the high tech and building materials. www

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