Heat Pump Rebates in Maine: 2026 Breakdown

Editor's note (October 2026): Efficiency Maine changed its insulation and air sealing rebates for work completed on or after October 1, 2026. They are now a fixed amount per zone of the house (attic, walls, basement) instead of a percentage of project cost, so the insulation rebate figures, combined totals, and cost examples below reflect the program when this article was published. See current Efficiency Maine rebates.

Editor's note (February 2026): The federal 25C tax credit expired December 31, 2025. Federal credits are no longer available for heat pump installations completed in 2026. This guide covers Efficiency Maine rebates, which are state-funded and unaffected by the federal expiration. Rebate amounts are income-dependent and subject to change. See current rebates.

Rebate figures last verified against Efficiency Maine's published rebate schedule on September 1, 2026.

The most common question we hear right now: "Is this still accurate?" - followed by a screenshot of a 2024 article listing heat pump incentives: $2,000 federal tax credit, $4,000 state rebate, stack them together for $6,000 off.

The federal piece is gone. But the Efficiency Maine rebates have actually increased since that article was written, and for income-qualifying households, the state incentive alone can reach $9,000 per project.

Here is exactly what is available for cold-climate heat pump installations in Maine in 2026, who qualifies, and what the fine print looks like.

What Changed: The Federal 25C Credit

The Energy Efficient Home Improvement Credit (Section 25C) expired on December 31, 2025. That credit offered up to $2,000 per year for heat pump installations - 30% of equipment and labor costs.

If you installed a heat pump in 2025, you can still claim that credit on your 2025 tax return. For installations in 2026 and beyond, the credit is not available. Congress could extend or replace it, but as of February 2026, there is no active legislation with a timeline.

This is the change that is causing confusion. People hear "tax credits expired" and assume all incentives are gone. They are not.

What Did Not Change: Efficiency Maine Heat Pump Rebates

Efficiency Maine's heat pump rebate program is funded by the Regional Greenhouse Gas Initiative (RGGI) and Maine utility surcharges. It is a state program, entirely separate from federal tax policy. The 25C expiration has zero effect on these rebates.

In fact, Efficiency Maine has been expanding and increasing rebate amounts over the past several years. The current program is the most generous it has been.

Rebate Amounts by Income Tier

For non-ducted whole-home systems, Efficiency Maine pays per rebate-eligible outdoor unit, up to three units per home, with the amount set by household income (ducted systems are paid a flat amount per housing unit, covered below):

• Any income (no verification required): $1,000 per outdoor unit, up to $3,000
• Moderate income: $2,000 per outdoor unit, up to $6,000
• Low income: $3,000 per outdoor unit, up to $9,000

These are lifetime limits per housing unit, not annual ones. For the full income thresholds, plus the weatherization and heat pump water heater rebates that stack on top, see our Efficiency Maine rebates page, which we keep current with the state's published schedule.

The jump from $3,000 to $9,000 for income-qualifying households is significant. For a two-zone cold-climate heat pump installation that might cost $12,000-$16,000, a low-income household's $6,000 rebate (two units at $3,000) brings the net cost down to $6,000-$10,000. For a real Greater Portland project that paired weatherization with two heat pumps and the rebates that came with it, see one family's switch from oil to a heat pump.

Income Qualification

Efficiency Maine uses household size and annual income to determine your tier. The thresholds change periodically, and the specific numbers depend on your household composition. During your energy assessment, we can walk through the qualification criteria and estimate which tier applies to your household.

Income verification requires documentation - typically tax returns or proof of enrollment in qualifying assistance programs. We handle the paperwork and submission as part of the project.

Which Heat Pumps Qualify

Not every heat pump on the market is eligible for Efficiency Maine rebates. The system must appear on the Efficiency Maine Qualified Product List, which specifies models that meet cold-climate performance criteria.

Cold-Climate Ratings

This is where the "cold-climate" distinction matters. Standard heat pumps lose significant heating capacity as outdoor temperatures drop below 20F. Cold-climate models - the kind rated for Maine winters - maintain effective heating output down to -15F or lower. Efficiency Maine requires cold-climate performance for rebate eligibility.

We install primarily Mitsubishi cold-climate systems. These units are on the Qualified Product List and perform reliably through Maine's coldest stretches. When someone asks whether heat pumps actually work in Maine, the answer depends entirely on the model. A cold-climate Mitsubishi is a different machine than the budget units sold at big box stores.

Heating-System and Home Requirements

Non-ducted whole-home rebates. Efficiency Maine pays for homes that use heat pumps as their primary heating system throughout the heating season. The heat pumps must be sized for at least 80 percent of the home's peak heating load. Heat pumps that cover less than 100 percent need supplemental heat, such as a wood or pellet stove or electric baseboard, to make up the rest, because a furnace or boiler you already have can serve only as emergency backup and its capacity cannot count toward the 100 percent. A heat pump added to take the edge off while a furnace or boiler still does most of the heating does not meet the rule.

Ducted whole-home rebates. Ducted whole-home systems are paid a flat amount per housing unit instead ($3,000 at any income, $6,000 at moderate income, $9,000 at low income). The ducted heat pumps must also be the primary heating system throughout the heating season, sized for at least 100 percent of the home's peak heating load, with all forced hot air furnaces removed. Efficiency Maine does not rebate dual fuel systems.

Supplemental rebate. The supplemental rebate is $3,000 for one single-zone heat pump, for a household with a member in MaineCare, HEAP, SNAP or TANF, with participation verified by Efficiency Maine. It must be the first heat pump at the home, in the owner's principal residence, and used to heat the home throughout the entire heating season. The installed heat pump must meet Efficiency Maine's design temperature requirement for the project location. This rebate has no primary heating or sizing condition, and it counts toward the housing unit's $9,000 low-income heat pump lifetime limit.

Conditions on the home. For every heat pump rebate, the building must be a single-family house, a two-unit duplex, a condominium, a mobile home or a mixed-use building with one or two housing units and no commercial electrical meter, and the housing unit must not have had a natural gas utility account before the upgrade. The low and moderate income tiers of the whole-home rebates, and the supplemental rebate, also require that the home is the owner's principal residence. A registered Efficiency Maine vendor must install the system, and the claim is due within six months of completion. We check which rule applies with you before you commit to a project.

Single-Zone vs. Multi-Zone: The Rebate Difference

This is where most homeowners get tripped up, and it is worth understanding before you get quotes.

Single-zone systems pair one outdoor compressor with one indoor head. Each zone operates independently. These are straightforward for rebate purposes: $1,000 per outdoor unit at the base tier. Install two single-zone systems and you qualify for $2,000.

Several single-zone systems in one home work the same way from a rebate perspective. Each outdoor unit earns its own rebate, up to the limit for your income tier.

Branch box (multi-zone) systems use a single large outdoor compressor connected to multiple indoor heads through a distribution box. These systems are popular because they require only one outdoor unit for the whole house. However, Efficiency Maine does not rebate multi-zone heat pumps, so a branch box system earns no per-unit rebate, however many indoor heads it feeds.

This is not a minor distinction. A homeowner who wants three zones of heating and cooling might get quotes for either three single-zone units ($3,000 in base-tier rebates) or one branch box system with three indoor heads (no Efficiency Maine heat pump rebate). Same number of rooms served, $3,000 difference in rebates at the base tier.

At Horizon Homes, we install primarily single-zone systems, one outdoor unit for each zone. There are good technical reasons for this beyond rebates - each zone has its own compressor, so one failure does not take down the whole system - but the rebate advantage is real and worth factoring into your decision.

Stacking Heat Pump Rebates with Other Programs

Heat pump rebates can be combined with other Efficiency Maine programs on the same project:

Heat Pump + Weatherization

If you install a cold-climate heat pump and also complete insulation and air sealing work, you can claim rebates from both programs. The insulation and air sealing program pays a fixed amount per zone of the house (attic, walls, or basement) by income tier, up to $8,600 per home ($5,600 per mobile home), and the heat pump program covers up to $9,000. Efficiency Maine also pays a $500 bonus on eligible whole-home heat pump upgrades completed and claimed through December 31, 2026, whether or not you also weatherize.

The two programs are paid separately, so a project that includes both earns a rebate from each. The current amounts for each program are on our Efficiency Maine rebates page.

This is why we talk about the whole-home approach. It is not just better building science - it is dramatically better economics.

Heat Pump + Heat Pump Water Heater

Adding a heat pump water heater to your project earns an additional $1,150 in rebates. These units are 2-3 times more efficient than conventional electric water heaters and work especially well in basement installations where the cool, dehumidified exhaust air is a bonus rather than a drawback.

What About the Whole-Home Bonus?

Efficiency Maine's $500 whole-home bonus applies to eligible whole-home heat pump upgrades completed, with the rebate claim emailed or postmarked, from March 1 through December 31, 2026. Weatherization work is not a condition. Single-wide mobile homes are not eligible for the bonus. We include it in the heat pump claim, so you do not need to apply for it separately.

How the Process Works

Step 1: Free Energy Assessment

We start with a free energy assessment of your home. This is a visual walkthrough - no equipment, no cost, no obligation. We look at your current heating system, assess your home's insulation and air sealing, and talk through which rooms you want to heat and cool with heat pumps.

Step 2: System Design and Proposal

Based on the assessment, we design a system sized for your home and your goals. The proposal includes a line-item cost breakdown, the estimated Efficiency Maine rebate for your income tier, and your net out-of-pocket cost.

If you are adding insulation or air sealing to the project, those costs and rebates are itemized separately so you can see the full picture.

Step 3: Income Verification (If Applicable)

For moderate and low-income tiers, we help you compile and submit the required income documentation. This adds a few days to the process but can mean the difference between a $4,000 and a $9,000 rebate.

Step 4: Installation

Cold-climate heat pump installation typically takes 1-2 days depending on the number of zones. The outdoor unit is mounted on a pad or wall bracket, refrigerant lines are run to the indoor head(s), and the system is charged and tested.

Step 5: Rebate Applied to Invoice

At Horizon Homes, we deduct the Efficiency Maine rebate directly from your final invoice. You pay only the net amount. We handle the rebate submission and collect the funds from Efficiency Maine ourselves.

This is not standard practice across the industry. Many contractors bill the full amount and leave you to apply for and wait on a rebate check that can take 4-8 weeks. We have been applying rebates directly to invoices since 2006 because we believe it removes a real barrier for homeowners who want to move forward.

Financing the Remaining Cost

After the rebate is applied, Efficiency Maine's Green Bank offers financing for the balance:

• Up to $25,000 in project financing
• 0% interest for a 1-year term
• Up to 7.99% for terms extending to 10 years

A two-zone cold-climate heat pump project might cost $14,000 before rebates. After a $6,000 rebate (low-income tier, two units at $3,000), the remaining $8,000 financed at 0% for one year means no interest cost if paid within 12 months. Over 10 years at 7.99%, the monthly payment is approximately $97.

Why Insulate First

One more consideration that affects both your comfort and your rebate math: insulating and air sealing your home before or alongside a heat pump installation means the heat pump can be smaller.

A drafty, under-insulated 1,800-square-foot home might need three zones of cold-climate heat pump capacity. That same home, properly air sealed and insulated to current standards, might only need two zones. The savings on equipment cost (and the additional weatherization rebate) can offset the cost of the insulation work entirely.

Efficiency Maine pays the whole-home bonus on the heat pump upgrade itself, not for pairing it with weatherization. The building-science case for doing both stands on its own: the combined result is dramatically better than either improvement alone.

Get Started

The best time to install a cold-climate heat pump is spring through early fall, before the heating season creates urgency and contractor schedules tighten. Starting the conversation now means you can lock in a spring installation date and have the system running before next winter.

Call us at (207) 221-3221 or schedule a free energy assessment. We will walk through your home, design a system that fits your space and budget, and show you exactly what Efficiency Maine will cover.

Horizon Homes has been installing cold-climate heat pumps across Greater Portland for 20+ years. We know which systems work in Maine, which rebates apply, and how to get you the maximum incentive on every project.