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December 5 – 11

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Project 1505

Theresa Passive House

Austin, Texas

Building Function

Single-Family
Project Type

Addition
ASHRAE Climate Zone

2A - Hot - Humid
Construction Completion

2020
Status

Final Certified
INT. Conditioned Floor Area

2218 sq. ft.

Core Project Team

Phius Certified Rater

Ned Fischer
Phius CPHC (Lead)

Trey Farmer
Project Submitter

Trey Farmer

Project Information

- Architecture Planning
  
  Studio Ferme
- Mechanical Systems Designer
  
  Positive Energy
- Additional Consultants
  
  Keith Simon,
- Construction Company
  
  CleanTag LLC
- Building Function
  
  Single-Family
- Project Type
  
  Addition
- Construction Type
  
  Wood Frame
- Number of Units
  
  1
- Program Version
  
  PHIUS+ 2018
- ADD'L Certification Badges
  
  PHIUS+ Source Zero
- INT. Conditioned Floor Area
  
  2218 sq. ft.
- Market Category
  
  Market Rate
- ADD'L Certifications
  
  DOE ZERH, ENERGY STAR for Homes, EPA Indoor airPLUS
- Project Delivery Method
  
  Integrated Project Delivery (IPD)
- Status
  
  Final Certified
- Design Certification
  
  April 6, 2021
- Final Certification
  
  February 4, 2022
- Construction Completion
  
  2020
- ASHRAE Climate Zone
  
  2A - Hot - Humid
- Region
  
  South Central

Performance

- Annual Heating Demand
  
  2.9
- Annual Cooling Demand
  
  12.07
- Peak Heating Load
  
  5.58
- Peak Cooling Load
  
  3.73
- Site Energy Use Index (EUI)
  
  12.66
- Site Energy Use Index (w/Renewables)
  
  -1.76
- Compliance Software
  
  WUFI Passive
- Source Energy (Residential)
  
  6459
- Air Tightness (per enclosure area)
  
  0.036

Enclosure

- Wall 1 Type
  
  Framing with Continuous Insulation
- Wall 1 R-Value
  
  26
- Wall 1 Insulation Type
  
  Mineral Wool, Other
- Roof 1 Type
  
  Unvented Roof
- Roof 1 R-Value
  
  33
- Floor Type 1
  
  Crawlspace Floor
- Floor 1 R-Value
  
  14
- Window Manufacturer 1
  
  Marvin
- Whole Window U-Value 1
  
  0.17
- Window Glazing SHGC 1
  
  0.26
- Window Manufacturer 2
  
  Marvin
- Window Manufacturer 3
  
  Marvin
- Door Manufacturer
  
  Pro Via

Systems & Equipment

- Ventilation System Manufacturer
  
  Panasonic
- Ventilation System Product Name
  
  Intellibalance 1000
- Ventilation System Layout
  
  Centralized
- Measured Ventilation Fan Efficiency
  
  0.8
- Heating System Manufacturer
  
  Mitsubishi
- Heating System Type
  
  Variable Refrigerant Flow (VRF)
- Cooling System Type
  
  Variable Refrigerant Flow (VRF)
- Renewable Energy Type(s)
  
  On-Site PV
- Renewable Energy Annual Production
  
  9370
- Renewable Energy System Size
  
  6.5