Tufts University geothermal heat pump heating cooling plan could cut energy loss from 20% to 4% to 6%, with no cost yet and a payback of more than 10 years

Tufts University geothermal heat pump heating cooling plan targets its biggest campus

The Tufts University geothermal heat pump heating cooling plan now under evaluation targets the Medford and Somerville campus, the largest of its 3 campuses. The campus now runs on a district heating system, a network of underground pipes that carry steam and hot water from a Central Energy Plant to buildings across campus, burning fossil fuels to make that heat. Tufts reporting states that system loses about 20% of its energy before it ever reaches a building. Ground source heat pumps draw heat from the ground itself, which stays around 55 degrees Fahrenheit year round, and raise it above 100 degrees for use inside buildings. Tufts reporting states that switch could cut the distribution loss to somewhere between 4% and 6%.

What Tufts has decided, and what it has not

The plan remains a conceptual design only. Dano Weisbord, Tufts chief sustainability officer and executive director of campus planning, says the university has not committed to construction and estimates a payback period of more than 10 years for a full conversion. No source names a dollar cost for the project. Tufts has named Lower Campus as a possible starting point for the conversion. A separate 2024 capstone project instead studied upper campus, a different part of campus examined nearly 2 years earlier, not the same current plan.

At this time, Tufts has a conceptual design.

Dano Weisbord, Tufts chief sustainability officer and executive director of campus planning. Source 1.

Tufts campuses already run the same technology elsewhere

Tufts own decarbonization strategy page states that Grafton and Boston Health Sciences, 2 of the other Tufts campuses, already run comparable geothermal heat exchange systems. That detail is only visible by reading the strategy page directly rather than the news coverage of the plan, and it means a Medford and Somerville conversion would extend a model already working elsewhere at Tufts, not test an unproven one. The same page reports that campus square footage across Tufts grew 60% since 1990, that electricity related emissions on the Boston Health Sciences campus fell 40%, and that solar meets about a quarter of the energy used on the Grafton campus.

Zoning rules and old buildings complicate the retrofit

Kelsey Arrington Podraza, a first year masters student in the Tufts sustainability program, says older campus buildings face zoning and historic preservation rules that make some upgrades harder. Aoife Schmitt, an undergraduate who studied the Central Energy Plant as part of a 2024 capstone project, says the approach favors reusing parts of the existing system rather than replacing it outright. The plant itself, built in 2018 to replace a heating plant that was 60 years old, already generates about half of the campus electricity onsite.

Making upgrades to these systems can be really challenging because of restrictions with zoning and historic preservation ordinances, and so heat pumps allow them to do a less intensive renovation.

Kelsey Arrington Podraza, first year masters student, sustainability program, Department of Urban and Environmental Policy and Planning, Tufts University. Source 1.

Instead of reinventing a whole new system, we're seeing if we can use parts of what's in the existing system.

Aoife Schmitt, undergraduate capstone student, Tufts University. Source 3.

Tufts has tied its own plan to a pending state bill

Tufts hosted Massachusetts state and Medford city officials on its own campus in July 2025 to support a proposed law that would let gas companies own and operate geothermal heat loops for large customers, naming universities and hospitals among the intended beneficiaries. Governor Maura Healey estimates the wider bill could save Massachusetts ratepayers more than 10 billion dollars over 10 years statewide, an estimate for the whole state, not funding directed at this specific project.