Although not an official standard, a ZEH home (or ZEB) must obtain a HERS index of 0. This level indicates that the home has increased insulation levels and uses only site generated energy such as photovoltaics or wind generation.
Although not an official standard, a ZEH home (or ZEB) must obtain a HERS index of 0. This level indicates that the home has increased insulation levels and uses only site generated energy such as photovoltaics or wind generation.