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Medford committee selects Option 1 (air‑to‑water heat pumps) for Roberts Elementary HVAC and roof replacement
Summary
After a technical briefing and questions about cost, disruption and solar readiness, the Medford School Committee approved Option One — an air‑to‑water heat‑pump approach that reuses existing hydronic distribution, minimizes in‑class disruption and positions the building to be solar‑ready. The project will proceed to schematic design for MSBA review.
The Medford School Committee voted to move forward with Option One for the Roberts Elementary accelerated repair project, favoring an air‑to‑water heat‑pump approach the design team said balances cost, disruption and future electrification.
PCA 360 (the owner's project manager) and RFS Engineering presented three feasibility options under the Massachusetts School Building Authority (MSBA) Accelerated Repair Program: (1) an air‑to‑water heat‑pump system that largely reuses existing hydronic distribution and keeps work concentrated in mechanical rooms; (2) a ground‑source (geothermal) system requiring bore fields and more disruptive site work; and (3) an air‑source/VRF hybrid with rooftop air handlers and energy‑recovery units that would require additional ductwork and reduce roof area available for PV.
The project team emphasized timeline constraints for summer construction windows and estimated the MSBA reimbursement rate for eligible ARP scope at about 53.32% if the work stays within HVAC, roof and required ADA upgrades. The team also presented a life‑cycle cost comparison showing geothermal as the highest capital cost with lower operating costs, and air‑to‑water as lower capital with modestly higher operating costs over time. The presentation included preliminary solar layouts and a plan to make the roof and electrical service "solar ready" so a future PV array can be installed with minimal additional work.
RFS senior mechanical engineer Goshi summarized the HVAC tradeoffs and technical limits, noting that heat‑pump systems "stop operating at a certain ambient conditions so require a backup source which would be boilers." The design team and the committee discussed acoustics for rooftop equipment, conduit and roof design for future PV, and the practical challenge of completing major work within short summer windows.
Member Russo moved to approve Option One; the committee voted in favor. The design team said it will proceed to develop the selected option to schematic design for MSBA submittal and to prepare bid documents with a goal of work staged across two summers to minimize disruption to school operations.
Next steps: schematic design development, MSBA board submittal (target October), city appropriation process, and the detailed design and procurement work to be timed to allow summer construction in 2027 and 2028.
