Case study of a DOE Zero Energy Ready home in Derby, CT, that achieves a HERS score of 45 without PV or HERS 26 with PV. The production home is one of a development of 7 two-story, 4,000+-ft² certified homes that have 2x4 walls filled with 1.5 in. closed-cell spray foam, 2-in. fiberglass batt, R-6.5 polyiso on the exterior, R-68 cellulose on the ceiling deck plus R-50 closed-cell spray foam in vaulted ceilings, R-10 rigid polyiso on basement walls, a tankless gas water heater, and a heat pump with gas furnace backup.