The
HERS Index
The
HERS Index is a scoring system established by the Residential
Energy Services Network (RESNET) in which a home built
to the specifications of the HERS Reference Home (based on
the 2006 International Energy Conservation Code) scores a
HERS Index of 100, while a net zero energy home scores a HERS
Index of 0. The lower a home’s HERS Index, the more
energy efficient it is in comparison to the HERS Reference
Home.
Each
1-point decrease in the HERS Index corresponds to a 1% reduction
in energy consumption compared to the HERS Reference Home.
Thus a home with a HERS Index of 85 is 15% more energy efficient
than the HERS Reference Home and a home with a HERS Index
of 80 is 20% more energy efficient.
Comparing
the New HERS Index with the Old HERS Score
For
homes rated before July 1, 2006, the rating score is known
as a “HERS Score.” The HERS Score is a system
in which a home built to the specifications of the HERS Reference
Home (based on the 1993 Model Energy Code) has a HERS Score
of 80. Unlike the HERS Index, each 1-point increase in a HERS
Score is equivalent to a 5% increase in energy efficiency.
Please see the table below for a comparison of the HERS Score
and the HERS Index.
|
HERS
Score |
HERS
Index |
| Reference
Home Score |
Reference
Home is assigned a HERS Score of 80 |
Reference
Home is assigned a HERS Index of 100, while a net zero
energy home is assigned a HERS Index of 0 |
| Reference
Home Basis |
1993
Model Energy Code (MEC) |
2006
International Energy Conservation Code (IECC) |
| Scale |
Each
5% increase in energy efficiency corresponds
to a 1-point increase in HERS Score |
Each
1% increase in energy efficiency corresponds
to a 1-point decrease in HERS Index |
| Energy
Use Considered |
Heating,
cooling, and water heating |
Heating,
cooling, water heating, lighting, appliances, and onsite
power generation* |
| ENERGY
STAR Requirement |
HERS
Score 86 |
HERS
Index of 85 in climate zones 1–5
HERS Index of 80 in climate zones 6–8 |
| Status |
Phasing
out |
Approved
by the RESNET Board of Directors. To be implemented
as of July 1, 2006. |
Energy
efficient choices can save families up to 30% on their energy
bills, and will show similar reductions on yearly greenhouse
gas emissions - all without sacrificing features, style, or
comfort.
EDGE
Energy can help builders
make energy efficient choices, design changes, and
provide them testing to qualify for a new home's
Energy Star Label.
|
EnergyStar
labeled homes offer more home, for less money, than standard
homes. These homes use reliable and established technologies
and building practices to operate 30% more efficiently than
homes built simply to local building code.
These
technologies and practices save the owners of an EnergyStar
home money on their utility bills, while also providing a
home that's more comfortable, more durable, good for the environment,
and cheaper to own.
Realtors
and LO's can use a HERS
Rating to help borrowers apply for EEMs
and IRS
tax credits.
In
some cases, the Rating can be subsidized by your
local utility company, mortgage lenders, or listing
agents.
|
To
gain a competitive edge, many homes are performing their Energy
Audits before an upcoming sale. The Audit is cheaper than
a full Rating, but can still identify a comprehensive list
of cost-effective energy improvements. Please contact
our staff if you would like more information about Audits
vs. Rating.
|