Home Energy Rating System

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hersThe Home Energy Rating System (HERS) is a tool used in green building construction, as well as in home energy auditing and certification programs. It is a relative scale that measures a home’s energy efficiency and performance, as compared to other homes. The HERS Index scale ranges from zero to 150, and the lower a home’s HERS Index, the more energy efficient it is. A zero indicates ideal energy performance, while a 150 indicates poor energy performance. A typical existing home will generally achieve a HERS Index of about a 130, and a standard code-built home will achieve about a 100. EarthCraft homes must perform 15 percent better than code, obtaining a HERS Index of 85 or less.

HERS ratings are highly versatile performance indicators that can be used to:

  • Verify that a home meet the requirements of green building programs like LEED® for Homes and EarthCraft
  • Fine-tune the projected energy performance of a building prior to construction
  • Qualify buildings for ENERGY STAR certification
  • Provide verification for Energy Efficient Mortgages (EEMs)
  • Benchmark and enhance current building performance