"Elements like triple pane windows and balanced ventilation systems—these are simply included as standard."


Key Features

  • Walls: 2x6, 16" o.c., R-23: 5.5" R-23 blown fiberglass, 1/2" plywood sheathing, heavy membrane with taped seams, 1/2" furring strips, fiber cement lap siding.
  • Roof: Truss gable roof: scissor truss, 5/8" plywood sheathing with taped seams, 4" R-20 graphite EPS rigid foam in two layers with staggered seams, 1/2" plywood, asphalt shingles.
  • Attic: Unvented (hot roof): 5.5" R-23 blown-in fiberglass in truss top chord.
  • Foundation: Uninsulated above-grade garage on pre-existing slab foundation. Floor above garage is 11-7/8" truss I joist with R-48 blown-in fiberglass.
  • Windows: Triple-pane, argon-filled, low-e, vinyl frame, U=0.16-0.20, SHGC=0.22-0.27.
  • Air Sealing: 0.94 ACH50, house wrap seams taped, roof deck seams taped, unvented attic, subfloor seams caulked; whole-house aerosol sealant before insulating.
  • Ventilation: ERV, bath fan boost, MERV 15 filter, 116 SRE, 119 ASRE.
  • HVAC: Heat pump, AC variable speed compressor, 14.1 SEER, compact duct design.
  • Hot Water: Heat pump water heater, 50-gal, 3.75 UEF.
  • Lighting: 100% LED, dimmers, clerestory window.
  • Appliances: ENERGY STAR clothes washer, dishwasher, refrigerator.
  • Solar: 5.85 kW, 18 325-W rooftop panels.
  • Water Conservation: Low-flow fixtures; compact PEX plumbing, stormwater management.
  • Energy Management System: Web-based PV monitoring; ERV has temp/humidity sensors.
  • Other: Electric vehicle charging station, CARB 2 cabinetry, low-VOC paints, formaldehydefree insulation, pre-finished GreenGuard Gold certified cork flooring, FSC-certified lumber.

Building Specifications

Conditioned Area 500 ft2
Bedrooms 1
Bathrooms 1
Stories 2
Climate Zone 4C
Completion Date November 2020

Modeled Performance

  With PV No PV
HERS Index -20 55
Annual Energy Cost ($100.00) $550.00
Annual Energy Cost Savings $1,150.00 $400.00
Annual Energy Savings 9,700 kWh 3,300 kWh
First 30 Years Savings $47,400.00 $16,000.00