The HERS or Home Energy Rating System was developed by RESNET, the Residential Energy Services Network.

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Understanding the HERS Index

The Home Energy Rating System (HERS) Index is the industry standard by which a home’s energy efficiency is measured. It’s also the nationally recognized system for inspecting and calculating a home’s energy performance.

 

How is HERS score calculated?

To calculate a home's HERS Index Score, a certified RESNET HERS Rater does an energy rating on your home and compares the data against a 'reference home'– a designed-model home of the same size and shape as the actual home, so your score is always relative to the size, shape and type of house you live in.
 

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How does the HERS Index work?

A certified Home Energy Rater asses the energy efficiency of a home, assigning it a relative performance score. The lower the number, the more energy efficient the home.

The US Department of Energy has determined that a typical resale home scores 130 on the HERS Index while a standard new home is awarded a rating of 100.

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A home with a HERS Index Score of 70 is 30% more energy efficient than a standard new home.

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A home with a HERS Index Score of 130 is 30% less energy efficient than a standard new home.

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For more information on this or other energy efficient tips and information, go to this website:  https://www.resnet.us/

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