Project Subtitle:
Project Description:
This zero-energy modular home was installed in support of the Zero Energy Modular Affordable Housing Initiative (ZE-MAHI) in partnership with Cooperative Development Institute (CDI), E4TheFuture, the Barr Foundation, Vermod and Pine Tree Village Coop homeowners’ association.
The home features ultra-efficient envelope, all-electric HVAC 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. The home was installed in December of 2020 to be used as a model home, open for tours until it ultimately sold to a homeowner. The plan to hold events in the model home was cut short because of the ongoing pandemic, and it was sold to the first person who toured the home.
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Occupancy Type and Details:
Owner-occupied, two adults live in the home full-time.
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Multiple buildings?:
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Site description:
The home was installed on a vacant lot in a manufactured housing community
Materials:
Interior finishes were selected for low VOC emissions. Resource efficiency is achieved in the factory setting, where waste is minimized by diverting usable cutoffs to subsequent homes.
Energy Highlights:
This all-electric home has a high performance envelope and very low air infiltration. Lighting and appliances are ENERGY STAR. Rooftop solar system was designed to produce expected annual electricity use.
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Datasets and Utility Bills sources and reliability:
Modeled consumption - Ekotrope
Modeled production - PV Watts
Subslab assembly:
n/a - Insulated R-40 floor
Above grade wall assembly:
Above grade walls are 2x4 double stud, blown fiberglass fill
Frame floors on piers 9.25" TJI, 16" o.c., blown fiberglass with an R-value of 40.
Flat attic assembly:
SIP roof and insulated ceiling: 11.25" graphite EPS, R-59
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Finances Description:
Total project costs were $264,000. The home was placed on a lot in a manufactured housing community so there was no cost for land acquisition. The homeowner pays approximate $500 a month for lot rent. It was sold to an income- eligible buyer on the first showing.
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State incentives:
$20,000 Zero Energy Modular Affordable Housing Initiative
Utility incentives:
$1,300 Mass Save Rebate
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Special architectural measures:
The home was designed to fit on a narrow preexisting lot in a manufactured housing community.
Energy Strategies:
A highly efficient structure is served by all-electric mechanical systems, efficient appliances and rooftop solar PV.
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Scope Description:
The home was designed to be a zero-energy home, and was built by Vermod, a modular factory in Vermont
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Window Description:
inyl framed, triple-glazed casement windows. Kasson and Keller - manufacturer
Door Description:
Steel and foam door construction: full lite. Therma-Tru manufacturer
Mechanical Equipment Installation Details and Comments:
Ducted heat pump with ventilation coducted. Ducts are entirely enclosed within the pressure boundary of the home, within a soffit that runs along one side the length of the home.