By Molly Cox
With a strong 7 person team, ZED is committed to designing homes and buildings that use 50% less energy than building code requires. Stephanie explained that most of their project makeup consists of single-family homes, compared to multi-family homes. They are also on track for the 2030 Challenge, which they started tracking in 2010 for their own projects.
When designing for most energy efficiency for a building, ZED prioritizes the building envelope first, followed by systems, and then renewables. ZED uses PHPP (Passive House Planning Package) for energy modeling of their custom home projects, but not all projects are expected to earn Passive House certification. The Energy Use Intensity (EUI) values for ZED’s completed projects are published on their website.
Stephanie showcased a Net Positive, LEED Platinum Certified four bedroom home in Lincoln, MA. This home has an impressive score of 0.27 ACH50 (Air changes per hour), which is a 90% reduction from code. ZED implemented systems such as air source heat pumps and renewables with a 13.1 kw solar PV array. She emphasized the importance of the direction the solar PV array faced, as that can hugely impact the EUI (south facing solar array is the best). It was impressive to see how closely aligned the monthly PV array predicted usage (performed by PV Watts) was with the actual usage. The homeowners are taking advantage of net metering in MA, to use the credits from the array’s overproduction in the warmer months, for the winter months when PV production is low.
In other news, the USGBC MA Chapter has a building tour of the Martin Luther King Jr. School on May 17th (register HERE), and a tour of Fort Hill on June 7th (register HERE). Come join us for our next RGBC meeting on June 12th!
See Stephanie's presentation slides here.
PE | Associate, LeMessurier
Vice President, AEW’s Architecture & Engineering group
Interior Designer, Jacobs, Boston
Senior Vice President, Market Transformation and Development U.S. Green Building Council
AIA LEED AP BD+C | Senior Associate, Gensler Boston 
LEED Fellow, WELL AP | Founder and Principal, Ecoworks Studio
LEED AP BD+C | Environmental Sustainability Manager, Armstrong World Industries
Sustainability Director, Steven Winter Associates
Assistant Professor of Exposure Science | Director of the Healthy Buildings program
Managing Director, Harvard University Office for Sustainability
Principal & Director of Certifications and Consulting, Epsten Group, Inc.
Vice President of Sustainability and Corporate Social Responsibility, Jamestown
Founder and Principal, Linnean Solutions | LEED AP, O+M; EcoDistrict AP
Associate Principal, BuroHappold Engineering
Senior Vice President, Sustainability at Kilroy Realty Corporation
Co-Founder, Facilitator at The Laurentia Project | LEED AP BD+C, LFA
Founder and President, Board of the Healthy Building Network
Building Technology Director, Kingspan North America
LEED® AP ID+C, BD+C, USGBC Faculty, WELL® AP, WELL Faculty and Fitwel Ambassador
Workplace Strategy Expert and Researcher, EYP
Principal, Integrated Ecostrategy
Senior Vice President, International WELL Building Institute
AIA, LEED AP BD+C, WELL AP
Principal, Bruner/Cott
Architect, Associate, and Sustainability Design Leader, Stantec Architecture and Engineering
FAIA, LEED Fellow, Long Green Specs
Products & Materials Specialist, BuildingGreen
Director of Acquisitions and Development
Director of Restorative Enterprise, Interface
Vice President of Sustainable Development, Shaw
Sustainability Manager, Consigli Construction Company
Global Head of Sustainability, Superior Essex