Ashtree Passive House
Building Use: Detached single-family residence
Project Type: New passive house building
3250 gross sf single family residence with attached garage
| Location: | Boise, Idaho 83712 | |
| Dwelling Units: | 1 | |
| PH Calculation Protocol(s): | PHIUS+ | |
| PH Modeling Software(s): | PHPP | |
| PH Certification(s): | PHIUS | |
| Year Of Construction: | 2016 | |
Project Size | ||
| Floor Area: | 2,844.9 ft2iCFA | 264.3 m2iCFA |
Performance | ||
| Heating Degree Days: | 5,600 °F•day/yr | 3,111.1 °C•day/yr |
| Cooling Degree Days: | 1,337 °F•day/yr | 742.8 °C•day/yr |
| Annual heat demand: | 3.94 kBtu/yr•ft2iCFA | 12.4 kWh/yr•m2iCFA |
| Heat load: | 3.10 Btu/hr•ft2iCFA | 9.8 W/m2iCFA |
| Annual cooling demand: | 1.31 kBtu/yr•ft2iCFA | 4.1 kWh/yr•m2iCFA |
| Cooling load: | 2.23 Btu/hr•ft2iCFA | 7 W/m2iCFA |
| Primary energy demand: | 35.60 kBtu/yr•ft2iCFA | 112.3 kWh/yr•m2iCFA |
| Primary energy demand after on-site generation: | 26.13 kBtu/yr•ft2iCFA | 82.4 kWh/yr•m2iCFA |
| Airtightness: | 0.01 ft3/min•ft2 | |
Envelope | ||
| Construction Type: | wood | |
| Floor Assembly: | Thickened-edge slab on grade over EPS | |
| Wall Assembly: | 2x6 structural wall, taped OSB air barrier, 8" z-girt assembly w/ cellulose, WRB, rainscreen (stucco or fiber-cement board) | |
| Roof Assembly: | Trusses w/ loose-fill cellulose | |
| Windows: | Zola Thermo uPVC | |
| Entry Doors: | Zola Thermo uPVC | |
Systems | ||
| Ventilation system: | Zehnder Comfoair 350 | |
| Heating/Cooling system: | (1) 12,000 Btu/hr Mitsubishi minisplit (FA12NA) lower level, (1) 9,000 Btu/hr Mitsubishi minisplit (FA09NA) upper level | |
| Domestic hot water system: | HPT Phoenix Light Duty (PH76-50) Gas-fired tank water heater | |
| Renewables: | 6kw PV system (installed March 2017) | |
Team | ||
| Passive House Consultant: | Scott Yribar | |
| Passive House Consultant Certification: | PHIUS | |
| Architect: | Scott Yribar | |
| Structural Engineer: | Kevin Murar | |
| Mechanical Engineer: | Kara Rouselle | |
| Contractor: | Enerform LLC | |
Comments | ||