A partnership between the Zero Energy Modular Affordable Housing Initiative and Habitat for Humanity

Project Team

Other Team Members

Megan McDonough, Pioneer Valley Habitat for Humanity

Brien Tal-Baker, SimpleCity Studio

Li Ling Young, VEIC

Alison Donovan, VEIC

Ratings, Awards and Recognition


Zero Energy Ready Home

Energy Star Score:
HERS Index::

The Zero Energy Modular Affordable Housing Initiative (ZE-MAHI) installed two zero energy homes in Florence, MA. Zero Energy Modular (ZEM) construction creates healthy, durable, factory-built homes. These homes can be both single family and mobile and manufactured home replacements. ZE-MAHI is a program of the Massachusetts Department of Energy Resources; through ZE-MAHI, ten ZEM homes will be installed across Massachusetts. The two Florence homes are the program's first installations. Construction was completed in September of 2019. ZE-MAHI provided program incentives to help offset the purchase price of the homes. Local utilities provided additional incentives. Pioneer Valley Habitat for Humanity acted at the developer for both homes, which are now owned and occupied by income-eligible families.

The homes feature ultra-efficient design and appliances (cold climate heat pumps, ventless dryers, advanced heating and ventilation systems) and rooftop PV sized to meet the modeled consumption of the homes.

Additional phots are available here: https://www.energy.gov/eere/buildings/doe-tour-zero-glendale-road-modula...

Quick Facts


Location Florence, Massachusetts
Building Type Single Family
Project Type Zero Energy
Basis of Performance Claim Zero Energy Program
Bedrooms 3
Bathrooms 1.5
Conditioned Floor Area 1,222 sq ft
Total Cost of Project $460,000

Energy Summary

Energy Data Type Zero Energy Program
Renewable Energy System Type(s) Photovoltaics

Zero Energy Ready Home

HERS Index -20
Energy Star Score -20
Annual renewable energy generated 7,664 kWh/year

Envelope and Mechanicals

Subslab assembly

n/a - Insulated R-40 floor over unvented crawl

Above grade wall assembly

Above grade walls are 2x4 double stud, 24 o.c., blown fiberglass.
Frame floors over an unvented crawl space are 9.25" TJI, 16" o.c., blown fiberglass with an R-value of 40.

Door Assembly

One 1/4 lite 24 sf door with a U-factor of 0.19 and one 1/2 lite 26 sf door with a U-factor of 0.23.

Air Changes per hour, ACH50 0.56 ACH50