"I have a lot of allergies…, and this year I haven’t had to take a single pill."


Key Features

  • Walls: 2x6, 24" o.c., R-26 total: advanced framed; dense-packed cellulose in cavity, 1/2" CDX plywood with all nails, joints, and holes taped. 2" cork, weather resistant barrier, 1x vertical + 1x horizontal battens, 1.25" Juniper open-joint cladding.
  • Roof: Gable roof: 16" parallel cord trusses dense-packed with cellulose, topped with taped membrane, 2x battens for air gap, 1/2" plywood sheathing, self-adhered membrane, standing seam metal roof. Flat roof: 2x10 rafters dense-packed with cellulose, 1/2" plywood sheathing taped, R-12 tapered polyisocyanurate foam board, TPO membrane.
  • Attic: No attic, cathedral ceilings, hot roof.
  • Foundation: Vented crawl space. Floor joists have 16" R-43 dense-packed cellulose.
  • Windows: Triple-pane, argon-filled, low-e2, fiberglass frame; U=0.15, SHGC=0.43.
  • Air Sealing: 0.88 ACH50, roof membrane taped to wall sheathing; all seams taped.
  • Ventilation: HRV, ERV in ADU, MERV 13 filters, boost switches in bathrooms.
  • HVAC: Central heat pump, 12.2 HSPF, 17.7 SEER, AC variable-speed compressor.
  • Hot Water: Heat pump, 2.90 EF, 80-gal, compact plumbing design, recirculation pump.
  • Lighting: 100% LED.
  • Appliances: ENERGY STAR refrigerators, dishwashers, clothes washers, ventless HP dryers.
  • Solar: 6.38-kW rooftop panels.
  • Water Conservation: Low-flow fixtures, PEX piping, compact plumbing.
  • Energy Management System: N/A
  • Other: Accessible ramp, kitchen, shower. Low-VOC flooring, cabinetry, paint.

Building Specifications

Conditioned Area 1,741 ft2
Bedrooms 3
Bathrooms 2.5
Stories 2
Climate Zone 4C
Completion Date January 2021

Modeled Performance

  With PV No PV
HERS Index 0 35
Annual Energy Cost $100.00 $500.00
Annual Energy Cost Savings $1,000.00 $600.00
Annual Energy Savings 12,800 kWh 7,300 kWh
First 30 Years Savings $41,500.00 $23,700.00