Skip to main content

- What is Passive Building?
  Your passive building questions, answered
  
  Passive Building
  
  Passive Building Principles
  
  Passive Building FAQs
  
  A Better Way to Zero
  
  Passive Building Foundations Training
- Sectors
  Passive isn't just for houses
  
  Single-Family
  
  Multifamily
  
  Office Buildings
  
  Schools
  
  Other Non-Residential
- Projects
  Phius Certified Projects are the most energy efficient and comfortable buildings in the world
  Find a Project
  
  Project Certification
  
  Submit a Project
  
  Certification Review Queue
- Products
  Phius Certified Products are guaranteed to perform to passive standards
  View Products
  
  Product Certification Overview
  
  Window Certification
  
  Panel Certification
- Professionals
  Phius Certified Professionals are on the cutting edge of high-performance building
  Find a Professional
  
  Phius Certified Consultant (CPHC®)
  
  Phius Certified Builder (CPHB)
  
  Phius Certified Rater
  
  Phius Certified Verifier
  
  Phius Certified Trades Professional
  
  Phius Associate
  
  Maintain Credentials
Our Approach
- New Construction
  Phius CORE and Phius ZERO provide the path for constructing a Phius building from the ground up.
- Retrofit
  Upgrade existing buildings to Phius standards using Phius CORE REVIVE and Phius ZERO REVIVE.
- Commercial
  Phius standards aren't just for residential buildings. Phius CORE COMM and Phius ZERO COMM can be applied to any non-residential building.
Categories
September 15 – 17

Phius Certified Builder Training & Certification Exam | Bellingham, WA | September 2026
Level up your career by becoming a Phius Certified Builder
Upcoming Sessions
- Phius Certified Consultant Training & Certification Exam | August 2026
  August 17 – 28
- Aug Office Hours - Project Questions
  August 18
- Phius Certified Builder Training & Certification Exam | September 2026
  September 14 – 25
- Sept Webinar: Phius Trades Training
  September 15
- Policy Work
  Promoting policies designed to grow passive building
  Policy Database
  
  Financial Incentives
  
  Codes
  
  Qualified Allocation Plans
  
  Cost Data
- Tools and Support
  Providing the tools you need to create healthier buildings
  Resource Library
  
  Certification Support
  
  Calculators and Protocols
  
  Feasibility Study
  
  METr Design Tool
  
  WUFI Passive Design Tool
  
  Climate Data
  
  Quality Assurance
  
  Tech Corner

Project 2475

Old Colony Phase Six

The Architectural Team

Boston, Massachusetts

Building Function

Multifamily
Project Type

New Construction
ASHRAE Climate Zone

5A - Cool - Humid
Status

Certified
INT. Conditioned Floor Area

115014 ft²

Core Project Team

Phius CPHC (Secondary)

Lisa Reed
Phius Certified Verifier

Mark Norton
Phius CPHC (Lead)

Maciej Konieczny
Project Submitter

Sabrina Larkin

Project Information

- Architecture Planning
  
  The Architectural Team
- Building Owner
  
  Beacon Communities LLC
- Mechanical Systems Designer
  
  Petersen Engineering
- Construction Company
  
  Dimeo Construction Company
- Building Function
  
  Multifamily
- Project Type
  
  New Construction
- Number of Units
  
  89
- Number of Stories
  
  5
- Program Version
  
  Phius CORE 2021
- All Electric
  
  Yes
- INT. Conditioned Floor Area
  
  115014 ft²
- Status
  
  Certified
- Design Certification
  
  April 15, 2024
- Final Certification
  
  August 7, 2026
- ASHRAE Climate Zone
  
  5A - Cool - Humid
- Region
  
  Northeast

Performance

- Annual Heating Demand
  
  3.21 kBTU/ft².yr
- Annual Cooling Demand
  
  4.76 kBTU/ft².yr
- Peak Heating Load
  
  2.91 kBTU/ft².yr
- Peak Cooling Load
  
  2.55 kBTU/ft².yr
- Site Energy Use Index (EUI)
  
  15.54 kBTU/ft².yr
- Site Energy Use Index (w/Renewables)
  
  18.58 kBTU/ft².yr
- Compliance Software
  
  WUFI Passive
- Source Energy (Residential)
  
  3460 kWh/person.yr
- Source Energy (Residential w/Renewables)
  
  4144 kWh/person.yr
- Air Tightness (per enclosure area)
  
  0.039 CFM50/ft²

Enclosure

- Wall 1 R-Value
  
  28
- Roof 1 R-Value
  
  40
- Floor 1 R-Value
  
  16
- Window Manufacturer 1
  
  Intus
- Whole Window U-Value 1
  
  0.18
- Window Glazing SHGC 1
  
  0.37
- Window Manufacturer 2
  
  Kawneer

Systems & Equipment

- Ventilation System Manufacturer
  
  Annexaire, Ventacity, Renewaire
- Ventilation System Layout
  
  Semi-Centralized
- Ventilation System Type
  
  ERV
- Sensible Recovery Efficiency
  
  79%
- Measured Ventilation Fan Efficiency
  
  1.29 W/cfm
- Heating System Manufacturer
  
  Mitsubishi
- Heating System Product Name
  
  PURY-EP264TSNU-A1, PURY-EP168TNU-A1, PURY-EP144TNU-A1, MXZ-SM36NAM-U1, PUZ-A24NHA7, PUZ-A12NKA7, PUZ-A18NKA7, PUHY-EP120TNU-A1 , PUHY-EP96TNU-A1, PURY-EP120TNU-A1, MXZ-SM48NAM-U1
- Heating System Type
  
  Variable Refrigerant Flow (VRF)
- Heating System Rating
  
  COP
- Heating System Performance (COP)
  
  3.66
- Cooling System Manufacturer
  
  Mitsubishi
- Cooling System Product Name
  
  PURY-EP264TSNU-A1, PURY-EP168TNU-A1, PURY-EP144TNU-A1, MXZ-SM36NAM-U1, PUZ-A24NHA7, PUZ-A12NKA7, PUZ-A18NKA7, PUHY-EP120TNU-A1 , PUHY-EP96TNU-A1, PURY-EP120TNU-A1, MXZ-SM48NAM-U1
- Cooling System Type
  
  Variable Refrigerant Flow (VRF)
- Hot Water System Manufacturer
  
  Mitsubishi
- Hot Water System Layout
  
  Centralized
- Hot Water System Type
  
  Split Heat Pump Water Heater
- Renewable Energy Type(s)
  
  On-Site PV
- Renewable Energy Annual Production
  
  112989 kWh/yr
- Renewable Energy System Size
  
  92kW