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Home Energy Rating System (HERS)
Lower score means more savings
The Home Energy Rating System, or HERS, is used to measure and rate a home's energy performance. A HERS score is based on a nationally recognized index, with a lower score meaning a more energy-efficient home.
To calculate a home's HERS score, a certified rater will compare it to a reference home that is roughly the same size and shape. According to the U.S. Department of Energy, the average resale home rates a 130 while a typical new home scores a 100 on the HERS Index.
What do the scores mean? A home scoring 70 is 30 percent more energy efficient than a standard new home. On the other hand, a home with a HERS rating of 130 is 30 percent less energy efficient than a standard new home.