Home Energy Rating System (HERS) Index
TerraWise Net-Zero Homes Achieve Highest Ratings
The Home Energy Rating System (HERS) Index is the nationally recognized scoring system for measuring a home’s energy performance. Developed by RESNET (Residential Energy Services Network) and introduced in 2006, the HERS Index is the industry standard by which a home’s energy efficiency is measured. Based on the results and analysis conducted by a RESNET Home Energy Rater, a home will receive a HERS Index Score. 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.
TerraWise Gets A HERS Score For Every Home
TerraWise Homes obtains a HERS Score for every new home it constructs. Most builders don’t provide a HERS Score at all and many that do are scores based on a model or other version of the home. Be sure a HERS score is for the specific address of the home to get a true rating of its energy efficiency.
How A HERS Score Is Determined
HERS home energy rating, conducted by a certified RESNET Home Energy Rater, consists of diagnostic testing using specialized equipment, such as a blower door test, duct leakage tester, combustion analyzer and infrared cameras to determine:
-Amount and location of air leaks in the building envelope
-Amount of leakage from HVAC distribution ducts
-Effectiveness of insulation inside walls and ceilings
-Any existing or potential combustion safety issues
Other variables that are taken into account include:
-Floors over unconditioned spaces (like garages or cellars)
-Attics, foundations and crawlspaces
-Windows and doors, vents and ductwork
-Water heating system and thermostats
The comprehensive HERS rating provides a computerized simulation analysis utilizing RESNET Accredited Rating Software to calculate a rating score on the HERS Index. The report will also contain a cost/benefit analysis for any recommended improvements and expected return on investment.
How Does the HERS Index Work?
To calculate a home’s HERS Index Score, the certified RESNET Home Energy Rater compares the data of a subject home against a ‘reference home’ – a design modeled home of the same size and shape. The lower the number, the more energy efficient the home.
The U.S. Department of Energy has determined that a typical resale home scores 130 on the HERS Index while a standard new home is rated at 100. A TerraWise Home will score below the standard new home due to higher energy efficient design and construction. Our Net-Zero Homes have a 0 score!
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.
Benefits of having a HERS rating?
A HERS rating has many tangible benefits that help homeowners and home buyers:
-Determine the energy efficiency of a home
-Calculate a more accurate cost of homeownership
-Enjoy a higher potential home resale value
Find more information about the benefits of HERS ratings on the RESNET website.