About the HERS Index
The average home registers at 100 on the HERS Index. Newly built homes tend to be more energy efficient and typically register at about 50 on the Index. The optimal rating for a home is a rating of zero. A HERS Index of zero indicates that the home uses no net purchased energy, and is considered a Zero Energy Building, which means that it produces the same amount of energy it uses.
Click here to learn more about the HERS ratings.