HERS ratings & kBtu/sf/yr
Is there a direct relationship between HERS ratings and actual energy use, such as kBtus/sf/yr? Energy Star is gaining traction and making incrememtal improvements to their standards. Stretch Codes in Massachussetts pretty much make Energy Star the default route to comply. So the HERS rating is gaining traction for consumers. Its based on a scale with “0” being a Zero Net Energy Home, and 100 being a code-based home from 2003 or some such year. But I wonder how the HERS rating is related to energy use per square foot per year. Those are the standards that set by the 2030 Challenge: In 2010 buildings aim to use 60% less energy than the average for the building type in 2001. In 2030, the goal is 100% less energy use. For homes in the northeast the 2010 target is 18.3 kBtus/sf/yr. Is there an equation to relate that to a HERS rating?
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