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Jun 26, 2026
UPDATED
Jun 26, 2026
Quick Answer
Mass Save is the energy efficiency program funded by Massachusetts utility ratepayers and run by the state's electric and gas utilities together. For HVAC work in 2026, the program centers on one upgrade: heat pumps. Qualifying whole-home heat pump installations earn $2,650 per ton up to $8,500, with a $500 sizing bonus for documented load calculations and a $500 weatherization bonus for homes with recent qualifying insulation work. A 0% HEAT Loan finances up to $25,000. Cooling-only AC installations and furnace-to-furnace replacements earn nothing, and equipment running R-410A stopped qualifying on January 1, 2026.
Mass Save is a ratepayer-funded program operated jointly by the Massachusetts electric and gas utilities, not a government grant or a manufacturer promotion. The charge funding it already sits on every utility bill in the state, which means every homeowner has been paying into the program whether or not they ever claim from it. The program rewards specific upgrades that reduce energy use, and for heating and cooling equipment, that reward structure now points almost entirely at one technology.
Base whole-home heat pump rebate, capped at $8,500
Conditional sizing and weatherization bonuses
Maximum 0% HEAT Loan financing for qualifying projects
Whole-home heat pump installations earn $2,650 per ton up to a cap of $8,500 in 2026. Two conditional bonuses stack on top of it. A $500 sizing bonus rewards systems sized to the home's full heating load through a documented calculation. A $500 weatherization bonus rewards homes with recent qualifying insulation and air sealing already completed. Partial-home installations earn a lower tier than whole-home conversions, a distinction that decides more money than any other single choice in the program, and one worth confirming before any quote gets compared.
The 617 Standard
Homeowners fund Mass Save through their utility bills for years, then leave the rebate unclaimed because the paperwork looks like a second project on top of the first one. We treat it as part of the installation instead. 617 HVAC is a Mass Save Heat Pump Installer Network contractor, and eligibility confirmation, equipment verification against the Qualified Products List, and the rebate paperwork all sit inside the design process rather than on the homeowner's desk. Every qualifying system in our written options shows its net price after the incentive, since that number, not the sticker, is the one worth comparing.
Technical clarification on system performance and diagnostics.
Not for cooling-only equipment. The program rewards electrified heating, and a central AC that only cools falls outside it entirely. A heat pump cools identically to a central AC and heats as well, which is what qualifies it for up to $8,500. That asymmetry often makes the heat pump the cheaper system after the incentive applies.
Heat pump mini-splits qualify, and cooling-only mini-splits do not. The tier depends on scope: a whole-home ductless conversion earns the full whole-home rate, while a partial installation serving some of the home earns a lower tier. The same per-ton structure applies once the equipment appears on the Qualified Products List.
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Three common projects fall entirely outside the rebate program, and knowing them prevents a costly assumption. A cooling-only central AC installation earns nothing, since the program rewards electrified heating rather than cooling alone. A furnace-to-furnace or boiler-to-boiler replacement earns nothing for the same reason. Equipment running R-410A refrigerant stopped qualifying on January 1, 2026, regardless of its efficiency rating. Qualifying systems run R-32 or R-454B and appear on the Mass Save Qualified Products List, which makes the refrigerant on the spec sheet a pass-or-fail line item rather than a detail.
“The program pays for the conversion, never the like-for-like swap.”
Contractor credential and financing sequence both sit inside the program's rules, not outside them. Installation by a Mass Save Heat Pump Installer Network contractor is a condition of the rebate itself, so an otherwise perfect project installed by a non-HPIN company forfeits the full amount. The 0% HEAT Loan finances up to $25,000 for qualifying projects, spreading the net cost after rebate across time at no interest. The rebate frequently reverses which system costs less, since a heat pump carrying $8,500 in incentives regularly lands below a cooling-only AC carrying none.
Massachusetts utility ratepayers fund it through an efficiency charge already on every electric and gas bill in the state. The utilities administer the program jointly and pay rebates from that fund. A homeowner claiming a rebate is drawing from a program they have already been paying into, which is worth remembering when the paperwork feels optional.
