Supplements: * The finished lower level sits atop 6" EPS-insulated concrete forms and a 1" EPS-insulated slab. * The 4.1" structural insulated panels form both wall and roof systems, the latter clad with GAF * Timberline energy-star-rated architectural shingles. * Master bedroom "attic" insulated with 12" cellulose batts. * All windows and two (2) slider doors/storefronts are Anderson Woodwright 400 series with argon-filled dual-paned low-e glazing. * The 96% efficient propane-fired Trane fresh-air furnace and central air-conditioning unit are paired with an energy recovery ventilator that draws indoor air from the kitchen "island" and expels it to the exterior while distributing clean air, heat, and cooling through the insulated duct socks that serve the entire structure. * Propane-fired fireplace insert provides additional warmth in great room * Propane-fired 11kW Generac standby generator with automatic transfer switch provides backup power for the entire house. *500 gallon propane tank (owned). * All-LED lighting. * 220v electric, plumbing, and propane services for washer/dryer units installed in both main-level closet and lower-level utility room. * duel flush toliet