Mass Save Rebates Explained
What Mass Save is, how it works, which utilities participate, and how to access rebates for home energy upgrades in Massachusetts.
What rebates does Mass Save offer in Massachusetts?
Mass Save is a statewide energy efficiency program administered by Massachusetts electric and gas utilities (Eversource, National Grid, Unitil, Cape Light Compact) under oversight from the Massachusetts Department of Public Utilities. It is not a government agency. Mass Save provides rebates for air-source heat pumps, insulation, air sealing, heat pump water heaters, and battery storage, as well as no-cost Home Energy Assessments and 0% HEAT Loan financing. Rebate amounts depend on your utility, heating fuel, equipment eligibility, and weatherization status — use the calculator to estimate your specific situation.
Which utilities participate in Mass Save?
Do I qualify for Mass Save rebates?
You may qualify for Mass Save rebates if: (1) your home is in Massachusetts and served by a participating utility — Eversource, National Grid, Unitil, or Cape Light Compact; (2) you are a residential customer of that utility; (3) the upgrade you are planning (heat pump, insulation, water heater) is on the current program's approved product or scope list; (4) you complete a no-cost Home Energy Assessment first, which is required for most insulation and heat pump rebate paths; and (5) your home does not have an active weatherization deferral (e.g., safety issues that must be addressed before work can proceed). Oil and propane homes typically qualify for higher heat pump rebate tiers than natural gas homes.
Caveat: This site estimates rebate eligibility based on publicly available program data. Actual approval depends on your utility's current program rules, equipment selection, and home conditions. Always verify with your utility or Mass Save before committing to a project.
Does Mass Save require weatherization before a heat pump rebate?
It depends on the program path. For the whole-home heat pump rebate path (the highest rebate tier), Mass Save typically requires that the home has completed or is completing insulation and air sealing work. For the partial-home path, weatherization may be recommended but is not always mandatory. In both cases, a no-cost Home Energy Assessment must be completed first — the assessor determines which path your home qualifies for based on current insulation levels, heating system, and utility participation. Homes with active weatherization deferrals (e.g., asbestos, structural issues) may be ineligible until the deferral is resolved.
Caveat: Program paths and weatherization requirements vary by utility and may change as Mass Save program rules are updated. Verify current requirements with your utility before assuming eligibility.
Do I have to use a Mass Save–approved contractor?
Yes. Mass Save rebates require that work is performed by a participating contractor enrolled in the Mass Save program. You cannot use a contractor of your own choosing and expect the rebate to apply. After your Home Energy Assessment, the assessor will typically provide a referral list of approved contractors in your area. You can also search the Mass Save website for participating contractors by zip code.
When do you need a home energy assessment?
A no-cost home energy assessment is available to most Massachusetts residents through their utility. For insulation and air sealing rebates, an assessment is typically required. For heat pump rebates, requirements vary by program path (whole-home vs partial-home).
Schedule through your utility's Mass Save program or through the Mass Save website. Assessments are conducted by approved contractors and result in a home report with recommended improvements and rebate eligibility guidance.
Schedule on Mass Save0% financing for eligible improvements
The HEAT Loan offers 0% financing for eligible Mass Save improvements including insulation, heat pumps, and weatherization. Available through participating banks. Loan terms and eligibility are set by lenders, not Mass Save directly. Always read the loan documents — 0% APR may have associated fees depending on the lender.
Not a government website. Not affiliated with Mass Save, any Massachusetts utility, the IRS, or any state agency. Rebate program rules, tiers, and amounts change without notice — always verify current eligibility with your utility or the Mass Save website before treating any estimate as confirmed.