HERS Testing


What is HERS?

HERS is an acronym for Home Energy Rating System (HERS)

What is HERS test?

A HERS Test is a measurement of a home’s energy efficiency. Home energy ratings can be used for either existing homes or new homes. A home energy rating of an existing home allows a homeowner to receive a report listing options for upgrading a home’s energy efficiency.

Why is HERS important?

The HERS Program was initially implemented to address construction defects and equipment installations that had historically not been done correctly. These HERS measures cover HVAC system and insulation installation.

In an update to the HERS Regulations, the rating of a home as a system (known as Whole House Home Energy Rating) was implemented, where a home is rated on a scale from 0 to 250 to show its efficiency relative to a reference home built to just meet the Title 24 Building Energy Efficiency Standards’ prescriptive requirements.


About HERS

Background of the Home Energy Rating System (HERS) Program

The California Energy Commission is required by Public Resources Code Section 25942 to establish criteria for a statewide home energy rating program for residential dwellings. The goal of the program is to create a consistent, accurate, and uniform rating system based on a single statewide rating scale that can serve to differentiate the energy efficiency levels between California homes and to prioritize the investment in cost-effective home energy efficiency measures.

The first iteration of the California HERS regulations, which became effective on June 17, 1999, established the requirements for Field Verification and Diagnostic Testing services used to show compliance with the Title 24, Part 6; Building Energy Efficiency Standards. These regulations also established the basic framework for HERS Rater training, certification, and quality assurance.

The 2009 update to the HERS Regulations included the requirements for California Whole-House Home Energy Ratings. These Ratings apply to existing and newly constructed residential buildings that include single-family homes and multi-family buildings of three stories or less. The HERS Regulations and the HERS Technical Manual establish a systematic process for the delivery of California Whole-House Home Energy Ratings to provide California homeowners and prospective home buyers with information about the energy efficiency of the homes they live in or are considering for purchase. The Ratings also provide an evaluation of the cost-effectiveness of options that can improve the energy efficiency in these homes.

The 2009 update also established a special designation that goes along with the California Whole-House Home Energy Rating program called the HERS Building Performance Contractor. A HERS Building Performance Contractor includes a contractor who is licensed by the California Contractors State License Board as a Class B General Building Contractor and who is, or who employs, a person certified as a California Whole-House Home Energy Rater who has successfully completed an Energy Commission-approved HERS Building Performance Contractor training program and who holds building science certifications from the Building Performance Institute (BPI). A HERS Building Performance Contractor evaluates the comfort and safety aspects of a home in conjunction with the home’s energy efficiency in order to install energy efficient measures that will result in the best possible performance of a home.

The training, certification, and quality assurance of HERS Raters conducting Field Verification and Diagnostic Testing services as well as HERS Raters conducting Whole-House Home Energy Ratings is administered by California Energy Commission-approved HERS Providers


HERS Providers & Raters

HERS Providers are approved by the Energy Commission based on, among other requirements indicated in the HERS Regulations, the Providers’ ability to create and maintain a Registry and Database, to provide ongoing access of the Registry and Database to Energy Commission staff, to train and certify HERS Raters, to create a Quality Assurance Program and conduct quality assurance on HERS Raters’ work, and to report annually to the Energy Commission certain data as required by the HERS Regulations.

HERS Providers are approved to train and oversee Raters conducting HERS verification in Residential and Nonresidential newly constructed buildings, additions, and alterations; the New Solar Homes Partnership Program (newly constructed residential buildings); and to conduct California Whole-House Home Energy Ratings.


!*Advisory GC does not preform HERS Testing. GC can refer you to a company with fair pricing*!

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