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Home Energy Rating System (HERS) Cheat Sheet by

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The Home Energy Rating System (HERS) is the nationally recognized scoring system for measuring a home’s energy perfor­mance. HERS was developed by the Reside­ntial Energy Services Network and introduced in 2006 as the industry standard measur­ement of home's energy effici­ency. Based on the results of an energy audit, a home will receive a HERS Index Score. The HERS Index Score gives an insight as to the home's ranking in terms of energy effici­ency. The audit provides the homeowner with a detailed report regarding energy problems in the house.

How Home Energy Score is Calculated

A compre­hensive home energy review and testing is conducted by a certified Home Energy Rater. The Energy Review consists of diagnostic testing using specia­lized equipment and analyzers to determine:
The amount and location of air leaks in the building envelope
The amount of leakage from HVAC distri­bution ducts
The effect­iveness of insulation
Existing or potential combustion safety issues

Other variables that are taken into account include:
Floors over uncond­itioned spaces (garages or cellars).
Attics, founda­tions and crawls­paces.
Windows and doors, vents and ductwork.
Water heating system and thermo­stats.

The HERS score is a calculated by Accredited HERS Rating Software.

HERS Index

Unders­tanding the HERS Index

The calculate a HERS Index Score is compared against a 'reference home' (a model home of the same size and shape as the actual home). The HERS Index Score is always relative to the size, shape and type of ideal model home. The lower the score-the more energy efficient the home.
The U.S. Department of Energy has found that the average resale homes score 130 on the HERS Index. Whereas new homes are rated at 100. Thus:
Home with a HERS Index Score of 70 is 30% more energy efficient than a standard new home.
Home with a HERS Index Score of 130 is 30% less energy efficient than a standard new home.

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