What Is a HERS Rating? | Home Efficiency Santa Fe
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Transcript of What Is a HERS Rating? | Home Efficiency Santa Fe
What is a HERS Rating?
Dee BangertPre-Construction Services
HERS Raterwww.palosantodesigns.com
In 1995, representatives of the national mortgage industry, the National Association of State Energy Officials, and Energy Rated Homes of America founded the Residential Energy Services Network (RESNET).
RESNET, guided by the mortgage industry, developed national standards for home energy ratings and energy mortgages.
In 2002, RESNET became a 501 (C) (3). RESNET develops the rating standards and
administers the training and certification of Raters and Quality Assurance Providers.
HERS = Home Energy Rating System
Before July 1, 2006 the rating was known as a “score”.
Now the HERS Index is used to compare a home’s energy use with that of the American Standard Home - sometimes also called the “Reference Home”.
The Reference Home has a set of criteria which do not change, such as:◦ It is wood frame and the same size as the rated home◦ It has 18% glazing area and distributed equally between
North, South, East and West.◦ Same fuel and equipment type as the rated home for
heating, cooling and water heating, except with efficiency ratings of federal minimums.
HERS Index
HERS IndexThe American Standard Home is given a score of 100, while a Net Zero Energy Home is Given a 0.
Each point on the Index equates to 1% energy use. A lower
number is better.
Energy Star version 2 Required a HERS Index of 85, 15% better
than the Reference House.
A HERS Index is also used by LEED for Homes and the National
Green Building Standard. Lower Index scores are required for higher levels of certification.
Plan Evaluation◦ A Projected Rating can be given from a set of plans and
specifications. Estimates are used for test data such as air infiltration (Blower Door) and duct leakage.
◦ Measurements can be taken for existing home’s window, door, floor and wall areas among other things.
On Site Inspections◦ Insulation Inspections allow for the highest grade of installation
to be used in the rating.◦ A Thermal Bypass Inspection is required by Energy Star.
Testing◦ A Confirmed Rating will require a Blower Door and Duct Leakage
tests. ◦ Palo Santo suggests having a Duct Leakage test done at rough-
in to ensure success at completion.
Components of a HERS Rating
Plan Evaluation◦ It is suggested that this be done toward the end of the design
phase, so the design can still be modified to meet the energy goals.
On Site Inspections◦ Under slab insulation inspections can be eliminated if photos
are provided, but it will still receive the lowest grade for installation. This can affect the HERS Index.
◦ A Thermal Bypass Inspection is required by the City of Santa Fe’s Residential Green Building Code, LEED for Homes, and Energy Star.
Testing◦ A Confirmed Rating will require a Blower Door and Duct
Leakage tests.
Components of a HERS Rating
Tax Incentives – New Mexico◦ Sustainable Building Tax Credit, for homes
certified in Build Green New Mexico or LEED-H could receive a tax credit.
◦ Solar Tax Credit – 10% or up to $9,000 for homeowner.
Tax Incentives – Federal◦ Energy Efficient Tax Credit - $2,000 for the
contractor (through 2016)◦ Solar Tax Credit – 30% of cost for homeowner
Why does a new home need a HERS Rating?
RESNET has approved three
different software
companies for HERS Ratings.
REM/Rate is the most used by
HERS raters in New Mexico.
HERS Rating Software
Libraries allow for many building types
to be created. Through the use of the library items, a
house can be created with any
number of combinations of wall
type, foundation type, ceiling type
and mechanical equipment.
Utility Rates are also set to report on cost
of energy used.
HERS Rating Software
Above Grade Wall Types
HERS Rating Software
Mechanical Equipment
Requires information such as:
The efficiency ratings of heating, cooling and water
heating equipment
Location of equipment
Thermostat settings
HERS Rating Software
Air Infiltration (Blower Door)
These results are estimated for a projected rating based on the
guidelines of the program qualifying for. Final results are
entered for a Confirmed Rating.
Mechanical Ventilation Systems
Heat Recovery Ventilators and Energy Recovery Ventilators
help HERS score. Other ventilation is needed to qualify
for some green building programs. City of Santa Fe now requires meeting ASHRAE 62.2.
HERS Rating Software
Duct Systems
Allows for more than one system.
Requires information such as:
Location, R-value of insulation on ducts as well
as which mechanical equipment uses it.
Leakage rates are estimated for the Projected Rating based on the program,
and final results are entered for the Confirmed
Rating.
HERS Rating Software
Blower Door: Tectite
Testing Software
Quick Reports:Energy
Annual load Annual Consumption
Annual Energy Cost
Quick and easy way to see how changes effect energy usage
REM/Rate Reports
Quick Reports:Compliance
HERS IndexPass/Fail for Energy Star
Pass/Fail for Federal Tax CreditPass/Fail for IECC and other
energy codes
Quick and easy way to see how changes
effect the HERS Index
REM/Rate Reports
Projected Rating:Energy Star
This is what you would receive as confirmation
that the planned building meets Energy Star. Once
the final tests are completed, the file is
reviewed by the Quality Assurance Provider and
the word DRAFT is removed.
This is just one of many reports available.
REM/Rate Reports
Detailed ReportsAction Report
Action - Graphic ReportAir Leakage Report
Building fileBuilder Affidavit
Building File ReportComponent Consumption Summary
Component Consumption Summary GraphicComponent Loads Summary
Component Loads Summary GraphicComponent Design Loads Summary
Component Design Loads Summary GraphicEconomic Summary
Emissions ReportEnergy Cost & Feature
Equipment SizingFuel Summary
Lights and Appliances SummaryPerformance Summary
Performance Summary GraphicPerformance Factors
Source Energy & EmissionsUtility Bill Reconciliation
ASHRAE 90.2 ReportsEnergy Star Reports (7)
IECC Compliance Reports (1998 – 2006)
REM/Rate Reports
Palo Santo Designs LLC is an Award Winning General Contractor specializing in the design and construction of Fine Custom Homes, Renovations and Distinctive Commercial Spaces in the Santa Fe area. Our experience is unsurpassed in the design and construction of high performance buildings, utilizing the most effective methods for energy and water efficiency, sustainability and comfort.
Choose Palo Santo Designs for your Custom Home Project in Santa Fe