"It is very satisfying to be able to monitor the house's energy usage and see that far more energy is being generated than used."
Homeowner
Key Features
- Walls: ICF, R-22 total: 11.25" ICF walls; composite wood siding.
- Roof: Truss gable roof: coated OSB taped, full self-adhered membrane, 3/4" furring strips, 5/8" plywood, 2nd self-adhered membrane, solar PV shingles.
- Attic: Unvented attic: 10" R-45 medium-density + 2" R-14 high-density spray foam.
- Foundation: Insulated daylight basement: R-22 11.25" ICF, above-grade vinyl trim and siding, below-grade cementitious boards. 3.5" R-26 closed-cell spray foam under slab.
- Windows: Triple-pane, argon filled, low-e2, vinyl frame, casement style, U=0.17, SHGC=0.19.
- Air Sealing: 0.20 ACH50, spray foam under slab, liquid-applied flashings at all roughopenings and penetrations, spray foam under roof and at eaves.
- Ventilation: ERV, CO2 sensors trigger higher speed. Boost settings in baths and kitchen. MERV 6 filter on fresh air intake, MERV 11 filter on supply to air handler, 76 SRE.
- HVAC: Ground-source heat pump with one, 3-ton central air handler, ground-loop configuration with a 5.0 COP, AC variable speed compressor, 34 EER, rigid metal ducting.
- Hot Water: Ground-source heat pump, 80-gal, 2.66 EF.
- Lighting: 100% LED, motion sensors.
- Appliances: ENERGY STAR refrigerator, clothes washer, ventless heat pump clothes dryer.
- Solar: 11.752 kW, 13.5 kWh battery storage, rooftop shingles.
- Water Conservation: EPA WaterSense toilets, central manifold with PEX piping.
- Energy Management System: Sensors for CO2, temp, humidity. Tracking of PV, energy use, HVAC, ERV.
- Other: Accessible floorplan, doorways. Low/no-emission paints, adhesives, sealants.
Building Specifications
| Conditioned Area |
3,481
ft2
|
| Bedrooms |
2
|
| Bathrooms |
2
|
| Stories |
3
|
| Climate Zone |
6A
|
| Completion Date |
June 2021
|
Modeled Performance
| |
With PV
|
No PV
|
| HERS Index |
-16
|
27
|
| Annual Energy Cost |
$300.00
|
$1,550.00
|
| Annual Energy Cost Savings |
$5,500.00
|
$3,350.00
|
| Annual Energy Savings |
36,400 kWh
|
22,200 kWh
|
| First 30 Years Savings |
$221,500.00
|
$135,300.00
|