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Get a Free QuoteHingham homeowners can't use Mass Save — but HMLP runs an adder-based program: a $750/ton base (up to $4,500), plus a $500 weatherization adder and a $1,000 whole-home adder. Rebates under $500 come as bill credits; over $500, as checks.
Verified against hmlp.com June 10, 2026. Federal 25C tax credit EXPIRED Dec 31, 2025.
HMLP pays $750 per ton for a cold-climate air-source heat pump, capped at $4,500. On top of that base you can stack a weatherization adder of up to $500 (if weatherized within 6 months of install) and a whole-home adder of up to $1,000 (if the system meets 100% of the heating load). Total HMLP rebates are capped at $10,000 per account. Rebates of $500 or less are paid as bill credits; over $500, by check. HMLP customers in Hingham cannot use Mass Save — this is their program instead.
Mass Save is funded by an energy-efficiency surcharge on investor-owned utility bills (Eversource, National Grid, Unitil). HMLP is a municipal lighting plant — its customers don't pay that surcharge, so they are not eligible for Mass Save heat pump rebates. Hingham .gov and generic rebate pages get this wrong often.
HMLP runs its own heat pump program with a distinctive adder architecture: a $750/ton base plus stackable weatherization and whole-home adders. Assessments are run by Energy New England (ENE). One important limit: gas-heated homes are noteligible for the HMLP rebate — only oil, electric, propane, or pellet/wood homes are.
| Feature | HMLP Program | Mass Save (IOU, for reference) |
|---|---|---|
| Who runs it | HMLP (assessments via ENE) | IOUs via Mass Save |
| Base ASHP | $750/ton, up to $4,500 | $2,650/ton, up to $8,500 |
| Structure | Base + stackable adders | Tiered per-ton + bonuses |
| Weatherization | $500 adder (within 6 mo) | Bonus / subsidy |
| Whole-home | $1,000 adder (100% of load) | Built into per-ton tier |
| Lifetime cap | $10,000 per account | No equivalent lifetime cap |
| Payout | ≤$500 bill credit / >$500 check | Rebate check / instant discount |
| Eligibility | HMLP electric customers only | Eversource / NGrid / Unitil only |
Mass Save whole-home standard ($2,650/ton, up to $8,500) shown for comparison only. HMLP customers are not eligible for it; HMLP's own amounts apply.
HMLP's base of $750/ton is the lowest of the six MA municipal light plants — but it's designed to be built up with adders, not read alone. Start with the base, then stack.
Up to $4,500
The foundation rebate for a cold-climate air-source heat pump. At $750/ton it is the lowest base of the six MA municipal light plants — but HMLP layers adders on top rather than baking everything into one number.
Within 6 months
Added when weatherization is completed within 6 months of your heat pump install. It rewards sealing and insulating the envelope so the heat pump runs efficiently.
100% of heat load
Added when the heat pump system meets 100% of the home heating load — a true whole-home, fossil-fuel-free design rather than a supplemental one.
Lifetime cap: $10,000 per account. All HMLP rebates — base, adders, and appliance rebates — count toward a single $10,000 lifetime ceiling per account. Plan your electrification so the highest-value upgrades land first.
Federal 25C Tax Credit: EXPIRED. Section 25C ended December 31, 2025. There is $0 in federal heat pump tax credits in 2026. The HMLP base rebate and adders are the live incentives.
HMLP's payout mechanics are unusually specific, and worth knowing before you budget. The method depends entirely on the dollar amount of your rebate.
Applied as a bill credit
Shows up as a credit on your HMLP electric bill.
Paid by check
HMLP issues a physical check for the rebate amount.
Timing. HMLP responds to applications within 10 business days. Apply in the same calendar year as your purchase, or within 6 months of the purchase date. Pre-approval is optional, but the QA form is required.
Two HMLP-specific gates: the assessment is run by Energy New England (ENE) Energy Advisors, and your existing heating fuel determines eligibility. Gas-heated homes are out; oil, electric, propane, and pellet/wood are in.
Assessment requirement. HMLP requires a no-cost energy assessment within the last 3 years (or scheduled), conducted by ENE Energy Advisors. The assessment also surfaces weatherization that can unlock the $500 adder.
Harbor-front and Crow Point homes sit close enough to salt water that outdoor-unit siting matters. Three things we check on coastal installs:
Within a half mile of salt water, an epoxy-coated or blue-fin condenser coil meaningfully slows corrosion. Ask for the coastal package in the quote — most NEEP-listed lines offer one.
Siting the unit on the landward side of the house cuts salt-spray exposure and wind-driven defrost load. The 12-inch clearance HMLP's QA form checks also keeps the coil above snow and splash.
A garden-hose rinse of the coil a few times each summer is the cheapest longevity upgrade a coastal owner can make — pair it with the annual maintenance visit.
The assessment comes first; the QA form and fuel check follow. HMLP turns applications around in 10 business days.
HMLP requires a no-cost energy assessment within the last 3 years, or one scheduled. These are run by Energy New England (ENE) Energy Advisors — a distinguishing feature of the Hingham program.
Eligible existing heating fuels are oil, electric, propane, or pellet/wood. Natural-gas-heated homes are not eligible for the HMLP heat pump rebate and should look at Mass Save gas-side offers instead.
Pre-approval is optional, but a quality-assurance (QA) form is required. Apply in the same calendar year as your purchase, or within 6 months of the purchase date.
HMLP responds within 10 business days. Rebates of $500 or less are issued as bill credits; rebates over $500 are paid by check.
A whole-home, weatherized electrification off oil or propane. Amounts are HMLP's own published figures, verified June 10, 2026, under the $10,000 lifetime account cap.
Base cold-climate ASHP (6 tons)
$750/ton, capped at $4,500
Whole-home adder (100% of load)
System meets full heating load
Weatherization adder
Completed within 6 months of install
Lifetime account cap
Total HMLP rebates per account
We design to 100% of your heat load and time weatherization inside the 6-month window so every adder lands.
HMLP offers additional appliance rebates beyond heat pumps. The current amounts vary, so rather than quote figures that may be out of date, confirm them directly on HMLP's site. Remember they also count toward your $10,000 lifetime account cap.
hmlp.com/rebates/appliancesHMLP serves the town of Hingham on Boston's South Shore. If your electric bill reads “Hingham Municipal Lighting Plant,” this is your program. Heat pump rebates are reserved for homes currently heated by oil, electric, propane, or pellet/wood.
HMLP is the sole electric utility for the town. Assessments are run by Energy New England (ENE) Energy Advisors.
Heat pump program questions and applications go to rebates@hmlp.com. HMLP responds within 10 business days.
HMLP pays $750 per ton for a cold-climate air-source heat pump, capped at $4,500. On top of that base, you can stack a weatherization adder of up to $500 (if weatherization is completed within 6 months of install) and a whole-home adder of up to $1,000 (if the system meets 100% of the heating load). Total HMLP rebates are capped at $10,000 per account over the lifetime of the account. Rebates of $500 or less are paid as bill credits; rebates over $500 are paid by check.
Solar economics in HMLP territory.
Reading’s highest-per-ton MLP program.
Taunton’s income-tiered MLP program.
Statewide Mass Save heat pump guide.
What a heat pump actually costs in MA.
How ccASHPs perform in New England winters.
Switching off oil heat in MA.
We design to HMLP's program rules — cold-climate equipment, an ENE assessment, weatherization to unlock the adder, and a whole-home load match — so you capture the base plus both adders.
