Heat Pump Season Is Here: What to Do Before June
Editor's note (March 2026): Rebate amounts in this article reflect conditions at the time of publication and are income-dependent. See current rebates.
Every June, the calls pick up. Homeowners who spent the winter thinking about cold-climate heat pumps finally decide to act when the first warm weekend hits. By then, most contractors are booked four to six weeks out. If you wanted cooling for June, you're now looking at July or August.
The same thing happens in reverse each fall. The first cold snap arrives in October, and suddenly everyone wants a heat pump installed before Thanksgiving. The wait stretches to December.
Spring is the window that gives you every advantage. If you're considering a cold-climate heat pump for your Maine home, here is what you need to know and do before June.
The Spring Timeline
Heat pump installation is not an overnight decision, and it shouldn't be. A good project involves several steps, each with its own timeline. Here is a realistic schedule for a spring start:
Weeks 1-2: Assessment and Evaluation
Everything starts with a free energy assessment. This is a visual walkthrough of your home where we look at your insulation, air sealing, current heating system, and comfort issues. The assessment takes about an hour, and you'll get a clear picture of what your home needs.
During the assessment, we're evaluating your home as a system. The most important question isn't "where should the heat pumps go?" It's "what does the building envelope look like?" A well-insulated, tight home needs a smaller heat pump system, runs more efficiently, and delivers better comfort. A home with a leaky envelope and thin insulation will struggle with any heating system.
Right now, in late March through April, assessment wait times are typically one to two weeks. By June, that stretches to three or four.
Weeks 2-4: Proposal and Planning
After the assessment, we put together a detailed proposal. This includes:
- Recommended scope of work (envelope improvements, heat pump system, or both)
- Equipment specifications and placement
- Cost breakdown with Efficiency Maine rebate estimates
- Financing options through Efficiency Maine Green Bank (starting at 0% APR)
Most homeowners take a week or two to review the proposal, ask questions, and make decisions. This is the right approach - there's no reason to rush.
Weeks 4-8: Envelope Work First (If Needed)
If your home needs insulation or air sealing work, we do that before installing heat pumps. This is the whole-home approach and it's how we do every project.
The reason is simple: insulating first reduces your home's heating load. That means we can install a smaller heat pump system that costs less and performs better. Skipping the envelope work and going straight to equipment is one of the most common mistakes we see, and it's one that homeowners pay for every month in higher operating costs.
Typical insulation and air sealing work takes three to five days on-site.
Weeks 6-10: Heat Pump Installation
The installation itself is faster than most people expect. A standard two or three-head mini-split system takes one to two days. The outdoor unit gets mounted on a wall bracket or ground stand, refrigerant lines are run to the indoor heads, and electrical connections are made. Indoor heads mount on walls or ceilings.
For spring installations, there's an added benefit: the system can be tested in both heating and cooling modes. Your installer can verify performance in real-world conditions before you need either one.
Weeks 8-14: Rebate Processing
Efficiency Maine rebates are applied directly to your invoice by the contractor, so you don't wait for a reimbursement check. But the processing on the back end takes time. Getting your project completed in spring means your rebate paperwork is submitted before the fall rush of applications.
Heat pump rebates through Efficiency Maine range from $1,000 to $3,000 per unit, depending on household income. Combined with insulation rebates of up to $8,000, the total incentive package can be substantial.
Ready to start the process? Schedule a free energy assessment and get ahead of the summer rush.
The Insulate-First Approach
We talk about this in every assessment because it matters that much. If your home has inadequate insulation or significant air leakage, installing heat pumps without addressing the envelope is like buying a fuel-efficient car and driving it with the windows open.
Here's what happens in practice:
- Without envelope work: A poorly insulated 1,800 square foot Cape Cod might need a three or four-head system to maintain comfort. The units run harder and longer, especially on cold nights. Operating costs are higher than they should be, and some rooms may still feel cold.
- With envelope work first: The same home, after air sealing and insulation, might only need two heads. The system runs efficiently because the home holds heat better. Every room is more comfortable. And the upfront equipment cost is lower.
At Horizon Homes, we handle both the envelope and the heat pump installation. That means one contractor, one plan, and one project. The insulation crew and the heat pump crew coordinate the work so there's no wasted time.
What About My Existing Heating System?
One of the most common questions we hear: "Do I have to rip out my boiler?"
The short answer is no. In most cases, we recommend keeping your existing heating system as backup. Cold-climate heat pumps work well down to -15F, but having a backup system for the occasional below-zero stretch gives homeowners peace of mind during the first winter.
The hybrid approach works like this:
- Heat pumps carry the load from roughly October through April, handling 80-90% of the heating season
- Existing boiler (or furnace) supplements on the coldest nights, typically when temperatures drop below 5-10F for extended periods
- Heat pumps provide cooling in summer, which your boiler never could
Over time, as you gain confidence in the system's performance, you may choose to rely on the heat pumps entirely. Some homeowners disconnect the old system after the first or second winter. Others keep it indefinitely as insurance. Either approach works.
If your existing boiler is reaching end of life, you might also consider a high-efficiency condensing boiler as the backup, combining a 95%+ efficient gas boiler with heat pumps for the best of both technologies.
Choosing the Right Contractor
Not all heat pump installations are equal. Here's what to look for when evaluating contractors:
Whole-home evaluation, not just equipment sizing
A contractor who walks into your house and immediately starts talking about where to put the heads, without looking at your attic, basement, or insulation, is skipping the most important part of the process. The envelope assessment should come first.
Efficiency Maine registered and experienced
Efficiency Maine maintains a list of registered vendors who can process rebates. Working with a registered vendor means your rebates are applied directly to the invoice. At Horizon Homes, we've been an Efficiency Maine Top-Rated Vendor for 10+ years.
Cold-climate rated equipment
This matters in Maine. Standard heat pumps lose capacity at low temperatures. Cold-climate units, like the Mitsubishi Hyper-Heating systems we install, maintain their output down to -15F. If a contractor is quoting non-cold-climate equipment for a Maine home, ask why.
One contractor for envelope and equipment
Working with separate contractors for insulation and heat pumps creates coordination challenges. The insulation team doesn't know what the heat pump team is planning, and vice versa. When one contractor handles both, the project is designed as a single scope with the whole home in mind.
What to Expect in Costs
Every project is different, but here are the general ranges for cold-climate heat pump installations in southern Maine:
- Single-head system: $4,500-$6,500 installed
- Two-head multi-zone system: $9,000-$13,000 installed
- Three-head multi-zone system: $13,000-$18,000 installed
These are before Efficiency Maine rebates, which can reduce the net cost by $1,000-$3,000 per unit depending on income. Financing at 0% APR is available through Efficiency Maine Green Bank for qualifying homeowners.
If your project includes insulation and air sealing, typical costs range from $6,000-$14,000, with rebates covering a portion depending on income. The combined project - envelope plus heat pumps - often qualifies for the highest total rebate amounts.
Don't Wait for the Rush
The pattern repeats every year. Spring is quiet. Summer is busy. Fall is packed. If you want your project completed before next heating season, the time to start is now.
Here's what "now" looks like:
- Schedule a free energy assessment - takes about an hour, no obligation
- Review the proposal and rebate options
- Schedule the work for late spring or early summer
- Have your system tested and running before the heat arrives
Call Horizon Homes at (207) 221-3221 or book your assessment online. We've been installing cold-climate heat pumps and weatherizing homes across Greater Portland since 2006.
We serve Portland, South Portland, Westbrook, Scarborough, Falmouth, Cape Elizabeth, and surrounding communities.
