Mass Save commercial heat pump rebates changed twice this summer. From 1 June 2026, every commercial heat pump project over 35 tons, whether air source, ground source or variable refrigerant flow (VRF), is processed as a custom project. From 1 July 2026, all commercial heat pump projects need pre-approval before equipment is installed.
For a facilities team in Massachusetts planning winter or 2027 electrification work, the order of operations has flipped. Design and sizing now come before purchasing, because the size of the system decides which rebate route is open.
Below 35 tons, the rates are fixed and generous
Projects at or below 35 tons follow the standard pathway. Mass Save lists $2,000 per ton for air source heat pumps, $2,800 per ton for air source VRF and $3,600 per ton for ground source systems. Equipment must appear on the Mass Save Heat Pump Qualified Product List (QPL) and must displace oil, propane, natural gas or electric resistance heat.
The pre-approval comes as a Rebate Commitment Letter (RCL). It is valid for four months. Installation needs to be scheduled inside that window.
The ceiling of the prescriptive route is worth up to $126,000
The figures below show the largest prescriptive rebate available at the 35-ton limit. Method: 35 tons multiplied by the published rate per ton. For reference, 35 tons of cooling capacity is about 123 kW.
- Air source heat pump: 35 x $2,000 = $70,000.
- Air source VRF: 35 x $2,800 = $98,000.
- Ground source heat pump: 35 x $3,600 = $126,000.
One ton more, and none of these figures is guaranteed. The project moves to the custom pathway.
Above 35 tons, the project must prove its case
Custom projects need pre-approval from the electric sponsor before installation. They must meet cost-effectiveness criteria and supply additional project information. In practice, the incentive depends on the engineering evidence: load calculations, displaced fuel, and expected energy savings in kWh.
The 35-ton cap is not per building. Mass Save bases it on the total heat pump tonnage for all projects on the customer account as of 1 June 2026. A campus or multi-site operator that phases work across several projects can cross the line sooner than expected.
Hybrid systems need controls that run both plants
Many industrial and commercial sites will keep a gas boiler as backup. Mass Save allows this, with a condition. The site must install an integrated control from the QPL, or certify that its existing building control system can run the heat pump and the fossil equipment in parallel.
The rules also exclude new construction and major renovation, which have separate pathways. Sponsors may require a post-installation inspection, and the incentive is not paid until it is complete.
Mass Save commercial heat pump rebates reward design done first
The new rules favor sites that know their numbers before they talk to installers. Start with an energy audit to establish the heating load and the fuel being displaced. Then size the system and decide whether a single project above 35 tons, with a custom case, beats a smaller prescriptive project.
Climeaction runs that sequence for manufacturing sites and commercial buildings, from heat pump and heat recovery design to delivery and verification. Talk to our team before you request your Rebate Commitment Letter.
Pre-approval for every project and a 35-ton account-wide cap mean sizing choices fix the incentive before equipment is ordered. Sites that audit and design first can choose the route that pays most.
