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