Home Energy Rating System (HERS) Cheat Sheet by Davidpol
index home energy rating hers
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.
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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