Many people consider a HERS® Index Score of 40 or less as a tipping point to net zero energy homes. In 2017, there were 2,099 homes that were HERS® Rated and had a HERS® Index Score of 40 or less. The breakdown of the number of homes with a HERS® Index Score of 40 or less by housing type is: The breakdown of the number of homes with a HERS® Index Score of 40 or less by state is: *Does not include homes rated in California through the California Title 24 Rating System The top six states with homes HERS® rated in 2017 with HERS® Index Scores of 40 or less are:
