Home Energy Rating System (HERS)

HERS rating index showing the rating scale from energy efficient to inefficient

A Home Energy Rating (HERS) is an analysis of a home’s energy efficiency. The HERS index is a scoring system established by the Residential Energy Services Network (RESNET). The HERS score can be described as a sort of miles per gallon (MPG) score for houses.

A HERS score compares new and existing homes to a reference home score of 100, which represents a home built to the 2006 International Energy Conservation Code standards. Each 1% reduction in energy use relative to this standard results in a 1 point reduction in the HERS score. A home that is 10% more efficient than a house built to the 2006 code level would have a HERS score of 90, and a house that was 40% more efficient would have a HERS score of 60. The less energy a house uses the lower the HERS score.

HERS ratings consider the house as a complete system. The HERS score incorporates all building shell components, mechanical systems, lighting, appliances, ventilation, and even renewables.

HERS ratings are used for energy code compliance, establishing eligibility for energy efficiency rebates, qualifying for energy efficient mortgages, and earning Energy Star designations. Upon completion, houses receiving a HERS rating have a sticker with the score and efficiency information permanently attached to the electrical panel.

The HERS rating process includes a checklist, analysis, and improvements assessments, and a report.

OVER 146,000 HOMES IN THE U.S. WERE HERS RATED AND ISSUED A HERS INDEX SCORE IN 2014

In 2014 there were 146,860 homes in the United States that were energy rated by certified RESNET HERS Raters and issued a HERS Index Score. According to the data from the U.S. Census Bureau this represents over 33.8% of all new homes sold in the nation. The average HERS Index Score of the homes rated in 2014 was 63.

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