If your electric bill says Central Maine Power, and for nearly every Portland address it does, your heat pump money flows through Efficiency Maine. CMP does not run its own separate rebate; the statewide program serves both CMP and Versant Power territories, and the utility on your bill mostly determines which service area's paperwork lane you use. What matters is the program itself: $1,000 to $3,000 per qualifying unit, up to $9,000 whole-home, paid after installation. Here is how a CMP-territory household actually collects.
The structure: per unit, income-tiered, capped at $9,000
Efficiency Maine pays by the unit installed rather than by tonnage. The standard range runs $1,000 to $3,000 per cold-climate heat pump unit, and where your household lands in that range is set by income tier. Income-eligible households claim the top figure, $3,000 per unit on up to three units, which is the road to the $9,000 whole-home maximum.
| Project shape | Standard floor | Top tier |
|---|---|---|
| One unit, main living space | $1,000 | $3,000 |
| Two units, most of the house | $2,000 | $6,000 |
| Three units, whole home | $3,000 | $9,000 |
The tier question is worth answering before anyone quotes, since it can triple the rebate on the same hardware. On a three-unit conversion the difference is $6,000, real money against a project that might gross $18,500. The complete program picture, scenarios included, is in our Portland rebates guide.
What the equipment has to be
Qualifying cold-climate models only. These machines hold their heating output through the coldest nights Southern Maine delivers, with Portland design conditions running near 5F, and the qualifying list is the enforcement mechanism. Ask for the specific model's listing in writing; it takes a competent shop minutes to produce.
Current qualifying equipment runs on R-454B refrigerant. An installer naming that standard unprompted is current; one quoting older-refrigerant stock is moving inventory the program has left behind.
Sizing has to fit the house. Efficiency Maine pays per unit, and the unit still has to carry its zone on a February night, so the load calculation, the room-by-room math against Portland's real winter, is what protects both your comfort and your claim. What the spec sheets should show is covered in our best heat pumps for Portland cold guide.
What is gone, and why it matters at quote time
The federal 25C and 25D tax credits expired on December 31, 2025, and the DOE HEAR program died with them. Efficiency Maine money is ratepayer-funded state money, alive and paying. The distinction earns its keep as a vetting tool: any 2026 proposal that sweetens its math with a federal credit is citing money that no longer exists, and the rest of that proposal deserves matching skepticism. Shops that file Maine claims weekly know exactly what is claimable; shops working from 2024 sales sheets do not.
How the claim actually moves
The channel is downstream: install first, money after. Two versions exist in the wild.
The plain version has you pay the contractor in full, submit the claim with the invoice showing model and serial numbers, and receive the rebate afterward. You float the money in between.
The smoother version, common among established Maine shops, discounts the invoice by the rebate up front, and the contractor collects the reimbursement. On a whole-home project that is $9,000 you never front. Neither model is wrong. Ask which one a bidder runs before signing, in writing, because on five-figure projects verbal understandings about money have a short half-life.
Keep every document: the invoice with models and serials, the load calculation, the commissioning report, the income-tier paperwork if you claimed the higher rate. When claims stall, the cause is nearly always a missing document rather than a rejected machine.
The six steps from first call to check
The clean sequence runs like this. A contractor visits and runs the load calculation. You settle your income tier with the documentation Efficiency Maine asks for, before quoting if possible. The proposal arrives naming the qualifying model, the unit count, and the rebate line by line. You confirm in writing who files the claim and who floats the money. The install happens, one to three days for most houses. Commissioning closes it: performance verified, documented, and the report filed with the claim.
Projects that go sideways usually skipped a step in the middle. The proposal that never named the model, or the tier conversation that happened after the contract was signed, is where four-figure surprises are born. An afternoon of diligence up front is the cheapest insurance this project offers.
A CMP-territory walkthrough
A cape in Deering, oil boiler on year twenty-three, no ducts. The load calculation lands on two zones: one unit carrying the open first floor, one for the bedroom level. Quoted gross: $15,000.
At the standard floor the rebate is $2,000 and net is $13,000. At the top tier it is $6,000 and net is $9,000. Same house, same machines, and the tier paperwork was worth $4,000, which is why it belongs at the start of the process. Fuel savings then start immediately: an 800-gallon oil house pays about $2,800 a winter at $3.50 a gallon, and the same heat by heat pump runs near $1,750 at typical rates. The full operating comparison is in our heat pump versus oil breakdown.
Landlords, condos, and the account question
The claim rides with the project and the property, so multi-unit situations need the ownership question settled early. A landlord electrifying a Parkside Portland two-family should establish before quoting whose name the claim travels under and how many units the project supports. Condo owners in Bayside face the association conversation about outdoor unit placement before anything else, and it takes longer than the install. None of this is difficult; all of it goes smoother sequenced early rather than discovered late. Renters have standing in the conversation too. A tenant paying the CMP bill and the heating bill has every reason to bring the program to the landlord's attention, with the per-unit math attached, because the rebate softens the owner's capital cost while the operating savings land on the tenant's side of the ledger.
Timing without a cliff
No end-of-year deadline forces a 2026 decision, and the honest advice is still to move in shoulder season. Southern Maine installer calendars jam once the first cold snap hits, careful installs happen when crews have room to breathe, and a system commissioned in September walks into winter already claimed. The alternative, quoting in January with a dead boiler and every contractor's phone ringing, is the expensive version of the same project.
Your actual number takes two minutes to start. Get a free quote, free and no obligation, sized to your house and priced with every Efficiency Maine dollar your address and income tier qualify for.