Case study of a New Mexico-based home builder who has built more DOE Zero Energy Ready certified homes than any builder in the nation. One example home achieved a HERS score of HERS 55 without PV or HERS 15 with PV. The one-story, 2,654-ft2 production home has 2x6 advanced framed walls filled with R-22 blown fiberglass, R-50 blown fiberglass in the vented attic, R-10 rigid foam under the first 4 feet of slab, a high efficiency central heat pump, ENERGY STAR appliances, and 90% LED lighting.