Photo of Mantell-Hecathorn Builders, Shenandoah Circle, Durango, CO.

Case study of a DOE 2015 Housing Innovation Award-winning custom home in the cold climate that got a HERS 50 without PV, or HERS 21 with PV, with 2-by-6, 24” on center walls with R-13 closed-cell spray foam plus 3.5” blown fiberglass, plus R-10 rigid exterior; R-22 ICF basement walls; vented attic with spray foam over top plates, R-65 blown fiberglass; 96 AFUE furnace, triple-pane windows, 80% LED.