"My favorite aspect of the home is all the natural light."


Key Features

  • Walls: Double wall, R-37 total: first floor double wall 2x6 + 2x4, upper two floors 2x6, 16" o.c., advanced framed 5.5" fiberglass, 5/8" coated OSB, 3" rigid rock wool, metal horizontal furring for air gap and attachment of terracotta tile siding.
  • Roof: Rafter flat roof and shed roof: 14" I-joist, 5/8" OSB. Shed roof: self-adhered underlayment, Class 4 asphalt shingles. Flat roof: 2" tapered insulation, cementitious board, 80-mil TPO.
  • Attic: Unvented attic: R-51 total: 3" R-21 closed-cell spray foam on underside of roof deck, 11" R-30 blown-in fiberglass to fill rest of netted I-joist cavity.
  • Foundation: Insulated basement, 2" rigid foam on exterior over waterproofing.
  • Windows: Double-pane, argon-filled, low-e2, motorized blinds, U=0.22, SHGC=0.34.
  • Air Sealing: 2.43 ACH50, seal all nail holes, tape all joints, aerosol sealed whole house.
  • Ventilation: ERV, MERV 10 filter at 2 air handler locations, 60 SRE, 69 ASRE, 50 ATRE.
  • HVAC: Ground-source heat pump with 2 air handlers, 1 radiant floor, 4 COP, 18.4 EER.
  • Hot Water: Ground-source heat pump for space and hot water, reverse indirect tanks, 4 COP.
  • Lighting: 100% LED, motion sensors, skylights, high LRV wall and ceiling paint.
  • Appliances: ENERGY STAR refrigerator, clothes washer, dryer.
  • Solar: 7.13 kW/unit, 9.8 kWh battery. Passive solar design.
  • Water Conservation: EPA WaterSense-certified home.
  • Energy Management System: Smart thermostats, PV/battery system tied to utility rates.
  • Other: EV charging. Accessible shower, framed for future elevator, low/no-VOC carpet, floors, cabinets, paint; shared electric car and electric bike.

Building Specifications

Conditioned Area 2,478 ft2
Bedrooms 2
Bathrooms 4
Stories 3
Climate Zone 5B
Completion Date December 2020

Modeled Performance

  With PV No PV
HERS Index -2 40
Annual Energy Cost $0.00 $1,300.00
Annual Energy Cost Savings $3,250.00 $1,950.00
Annual Energy Savings 27,100 kWh 16,100 kWh
First 30 Years Savings $131,100.00 $79,300.00