How Does the HERS Index Work?

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

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

A home with a HERS Index Score of 70 is 30% more energy efficient than a standard new home built to code. As our HERS flyer indicates, Wise engineered homes are guaranteed to be rated well below 70 to provides the ultimate in energy efficiency and comfort!