HERS is an acronym for Home Energy Rating System.  A HERS rating is the process by which a HERS index is calculated.  The HERS index is the industry standard by which a home's efficiency is measured.

What is a HERS rating?

WF Rogel LLC, a certified Home Energy Rater, assesses the energy efficiency of a home through software modeling, inspection, verification and testing.  The lower the number, the more efficient the home.  The U.S. Department of Energy has determined that a typical resale home scores 130 on the HERS index, while a new standard home is awarded a rating of 100.  Many towns on Long Island have mandated new homes be built with a HERS index of 70 or less.  A home with a HERS index of 70 is 30% more efficient than a standard new home.

How is the HERS index Calculated?
  • All exterior walls (both above and below grade)
  • Floors over unconditioned spaces (garages and unconditioned basements)
  • Ceilings and roofs
  • Attics, foundations and crawlspaces
  • Windows and doors
  • HVAC systems including ductwork
  • Domestic water heating systems
  • Duct system leakage
  • Whole house leakage

What Items are Factored into the HERS rating?

In the State of New York, provisions of the Energy Conservation Construction Code

must also be complied with and verified.  Some of these items are:

  1. Building envelope air sealing
  2. ICAT recessed lights
  3. Gasketed and insulated attic hatch
  4. Programmable thermostats
  5. Proper duct insulation
  6. Sealed ductwork
  7. R-3 mechanical system pipe insulation
  8. ACCA Manual J calculation
  9. 50% high efficacy lamps
  10. Duct tightness testing
  11. Whole house tightness testing

Mandatory Requirements of the

2010 New York State Energy Conservation Construction Code

HERS and Energy Star Ratings

WF Rogel LLC 

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