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The Residential Energy Services Network (RESNET) was founded in 1995 as an independent, non-profit organization to help homeowners reduce the cost of their utility bills by making their homes more energy efficient.
​​The HERS Index Score can be described as a sort of miles-per-gallon (MPG) sticker for houses, giving prospective buyers and homeowners an insight as to how the home ranks in terms of energy efficiency. In addition to a HERS Index Score, a home energy rating also provides the homeowner with a detailed report regarding energy problems in the house.

Developed by the Residential Energy Services Network (RESNET) and introduced in 2006, the HERS Index is the industry standard. Government agencies such as the Department of Energy (DOE), Department of Housing and Urban Development (HUD) and the Environmental Protection Agency (EPA) recognize the HERS Index as an official verification of energy performance.

​A home energy rating is an analysis of a home’s energy efficiency; as per the Home Energy Rating System (HERS) Index. The HERS Index is the nationally recognized scoring system for measuring a home’s energy performance. Based on the results, an energy-rated home will receive a HERS Index Score.

​​How Does a Home Energy Rating Work?

A comprehensive HERS home energy rating, conducted by a certified RESNET Home Energy Rater, is the most in-depth energy performance assessment of a home that you’ll find. It consists of diagnostic testing using specialized equipment, such as a blower door test, duct leakage tester, combustion analyzer and infrared cameras.

​​To calculate a home’s HERS Index Score, a certified RESNET Home Energy Rater will do a home energy rating and compare the data against a 'reference home' – a design modeled home of the same size and shape as the actual home, so the HERS Index Score is always relative to the size, shape and type of house you live in. The lower the number, the more energy efficient the home.

A typical resale home represents 130 on the HERS Index while a reference home (a standard new home built in 2006) is rated at 100.  A home with a HERS Index Score of 70 is 30% more energy efficient than a standard new home.  A home with a HERS Index Score of 130 is 30% less energy efficient than a standard new home.
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