The Legacy House got its U.S. Department of Energy Zero Energy Ready Home (1) certification (dated August 1, 2019). That’s a recognition of the quality of the work done to build an efficient home. A standard new home has an HERS Index (2) rating of 100 or thereabouts. The Legacy House came in at 17. Lower is better, of course.
The certificate projects an annual energy cost of $950 and annual electricity savings of 27,934 kWh. Estimated CO2 reduction is 24.9 tons. We will watch it and see how accurate this information is.