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South Kingstown project team recommends central heat‑pump plant and PV readiness over full geothermal for new high school
Summary
After feasibility testing, designers told the joint Town Council and School Committee that site constraints limit a full geothermal well field and that a central heat‑pump chiller paired with rooftop heat pumps and PV readiness yields lower 20‑year life‑cycle cost; geothermal would add an estimated $2.85 million now and still may not deliver required state bonus points without additional costly water systems.
Designers advising South Kingstown’s new high‑school project recommended a central heat‑pump chiller and making the building photovoltaic‑ready rather than committing to a full geothermal well‑field, citing site constraints, lifecycle costs and uncertain state reimbursements.
Kate Turner, a senior project manager with owner’s representative Left Field, said the schematic construction budget was previously estimated at $116,000,000 but schematic design estimates came in at $133,000,000; the team has negotiated roughly $9.5 million in reductions and identified about $6.2 million more in potential savings, leaving a remaining gap they are still working to close.
Phil Conte of Studio Jade summarized the technical findings. Conte said a feasibility test well and thermal conductivity testing showed the site cannot realistically host the well field needed for full geothermal coverage. “No matter what the cost was… at this point, we would say, no, we do not have enough real estate,” Conte said. The team’s feasibility modeling found a full system could require far more wells than the property can accommodate; the schematic estimate had carried 40 wells while the study suggested 30 wells could meet roughly 50% of the building heating and cooling load.
Conte explained performance tradeoffs: geothermal heat pumps historically had higher efficiencies but the efficiency gap with modern heat‑pump chillers and air‑source systems has narrowed. He said the design team ran 20‑year life‑cycle models and that, on that basis, a central heat‑pump chiller has the lowest net cost over two decades. “Our recommendation would be to move forward with the central plant approach and then pivot the renewable focus on photovoltaics,” Conte said.
The team also cautioned that state bonus reimbursement requires both energy and water reductions; achieving the water‑use measures (for example, graywater systems) would drive additional initial cost and operational complexity. The design team estimated the incremental capital to add geothermal at roughly $2,846,700; by contrast, gaining two additional state reimbursement points was estimated at about $2,300,000 on the eligible base — not enough in itself to cover the geothermal delta and in any case would require costly water‑reuse work to qualify.
Town staff and councilors asked about maintenance and local service capacity. Conte said geothermal well piping has few moving parts and pumps can be serviced by local mechanical contractors, while adding that commissioning and third‑party verification would be required to ensure long‑term performance.
Next steps: the project team asked the council for directional guidance to move architectural and mechanical plans forward and recommended the council consider PV readiness and pursuing solar grants over an immediate cash outlay for geothermal. The council did not take a binding vote on the mechanical system at the meeting; staff said a formal decision and any budget action would be brought back in January.
