Case study of a DOE Zero Energy Ready Home in River Forest, IL, that scored HERS 17 without PV. This 4,763-square-foot custom passive house has R-54 ICF walls, a vented attic with R-100 blown fiberglass, plus R-40 rigid EPS under the slab, triple-pane windows, two ductless mini-split heat pumps, and redundant air sealing and flashing details.