What to Ask Before Hiring a Heat Pump Installer

Three quotes for the same home, the same goals, the same approximate budget, and three completely different recommendations: one installer proposes a single-zone system with one outdoor unit and one indoor unit; another proposes a multi-zone system with one outdoor unit and four indoor units; a third proposes two separate single-zone systems. Prices range from $8,000 to $24,000.

This is not unusual in the heat pump industry, and it puts you in an impossible position: how do you compare quotes when the recommendations are fundamentally different?

The answer is to ask the right questions. The questions below are designed to help you evaluate not just the quote, but the installer's understanding of your home, the technology, and the building science that determines whether a heat pump system will actually perform as promised in a Maine winter.

Before the Quote: Questions About the Assessment

"Did you do a heat loss calculation for my home?"

This is the most important question you can ask, and the answer immediately separates competent installers from those who are winging it.

A proper heat pump system is sized based on a heat loss calculation - a room-by-room analysis of how much heat the home loses based on insulation levels, window sizes, air leakage, and other factors. The calculation determines how much heating capacity each area of the home needs, which drives the number and size of indoor units and the outdoor unit capacity.

An installer who proposes a system without doing a heat loss calculation is guessing. They might be right - but they might oversize or undersize the system, both of which lead to performance problems and higher costs.

If the installer says "I've been doing this for 20 years, I can tell by looking at the house," that experience has value, but it does not replace the math. Good installers calculate even when they are confident in their estimate, because the calculation catches things that intuition misses.

"Did you account for the condition of my insulation and air sealing?"

This question matters because a heat pump's performance is directly affected by the building envelope. A well-insulated home with good air sealing needs a smaller heat pump system than a drafty, poorly insulated home of the same size.

If the installer sized the system without evaluating (or at least asking about) your insulation and air sealing, the system may be sized for a building condition that does not reflect reality. An installer who asks about your insulation, looks at the attic, and considers the building envelope is thinking about the whole system - not just the equipment.

At Horizon Homes, we evaluate the building envelope as part of every assessment because we do both insulation and heat pumps. We often recommend insulating and air sealing first, then right-sizing the heat pump for the improved home. This sequence saves money and improves performance.

"What temperature did you design the system for?"

In Maine, a cold-climate heat pump system should be designed to handle the heating load at or near the design temperature for your area - typically 0 to -5 degrees Fahrenheit for southern Maine.

An installer who designs for 20 degrees (because that is where the system runs most efficiently) is going to undersize the system for the coldest days. An installer who designs for -15 degrees may oversize the system for everything except the handful of coldest nights per year.

The right answer depends on your backup heating situation. If you have a boiler or furnace as backup, designing the heat pump for moderate cold (5-10 degrees) and letting the backup handle extreme cold can be cost-effective. If the heat pump is your sole heat source, it needs to be sized for the design temperature.

About the Equipment: Questions About the System

"What brand and model are you recommending, and why?"

Different heat pump brands have significantly different performance characteristics in cold weather. Not all heat pumps are "cold-climate" rated, and even among those that are, performance varies.

Look for systems that maintain rated capacity down to low outdoor temperatures. Mitsubishi Hyper-Heat systems, for example, maintain capacity to -13 degrees Fahrenheit. Some other brands lose significant capacity below 15 or 20 degrees, which is a problem during a Maine January.

An installer who can explain why they recommend a specific brand - based on cold-weather performance data, reliability track record, and warranty terms - is making an informed recommendation. An installer who says "we install Brand X because that's what we carry" may be selecting based on business relationships rather than your home's needs.

"Why this number of indoor units?"

The number of indoor units (heads) is one of the biggest variables in heat pump quotes. One installer might recommend one unit for the whole first floor. Another might recommend individual units for four separate rooms.

More heads is not always better. Each additional indoor unit adds cost, creates more maintenance points, and can complicate the system. The right number depends on your home's layout, how open or compartmentalized the floor plan is, which rooms need dedicated temperature control, and the heat loss characteristics of each zone.

An installer who can explain their reasoning - "your open-plan first floor can be served by one strategically placed unit, but the master bedroom upstairs needs its own because it is separated from the others" - is thinking about your home. An installer who defaults to one head per room without explaining why may be over-engineering (and over-pricing) the system.

"Is this system cold-climate rated? What happens at -10 degrees?"

This is a critical question for Maine installations. Standard air-source heat pumps lose significant heating capacity as outdoor temperatures drop. At 10 degrees, a standard heat pump might deliver only 60-70% of its rated capacity. At 0 degrees, it might struggle to heat at all.

Cold-climate heat pumps are designed specifically for this challenge. They use enhanced compressor technology, variable-speed operation, and optimized refrigerant management to maintain heating capacity at low temperatures. This is what "cold-climate" means - it is not just a marketing term.

Ask the installer for the capacity data at 0 degrees and -10 degrees. If they cannot provide it or say "it'll be fine," ask again. This data is published for every heat pump model and should be part of the system design.

"What is the SEER2 and HSPF2 rating?"

SEER2 measures cooling efficiency. HSPF2 (Heating Seasonal Performance Factor) measures heating efficiency over a typical heating season. Higher numbers mean better efficiency and lower operating costs.

For cold-climate installations in Maine, HSPF2 is the more important number because heating is the dominant use. Look for HSPF2 ratings of 10 or higher for good cold-weather performance.

An installer who discusses these efficiency metrics and explains how they translate to operating costs is helping you understand the long-term economics of your investment.

About the Installation: Questions About the Work

"Where do you plan to place the indoor units?"

Placement matters for both comfort and performance. A wall-mounted unit placed too high blows warm air at the ceiling (where you do not need it). One placed in a hallway may not adequately heat adjacent rooms with doors closed. One placed on an exterior wall with poor insulation works harder than one on an interior wall.

Ask the installer to explain their placement choices and how those choices affect heating distribution in your home. If they seem to be choosing locations based on installation convenience (shortest line set run, easiest mounting) rather than heating effectiveness, push back.

"Where will the outdoor unit go?"

The outdoor unit location affects performance, noise, aesthetics, and maintenance access. Best practices include:

• Elevated off the ground (on a wall bracket or stand) to keep it above snow level - critical in Maine
• Away from bedrooms if possible, as some units produce noticeable fan noise
• Protected from prevailing wind and not under a roof drip line that would ice over the unit
• Accessible for maintenance and filter cleaning

An installer who thoughtfully considers these factors is looking out for your long-term satisfaction. One who plans to set the unit on the ground next to the foundation is creating a maintenance headache every time it snows.

"What is your defrost strategy?"

Cold-climate heat pumps periodically run defrost cycles to clear ice from the outdoor coil. During defrost, the system temporarily reverses operation, which means it briefly cools the home rather than heating it. A well-designed system minimizes the frequency and duration of defrost cycles and manages the temporary comfort impact.

Ask how the system handles defrost in cold weather and whether the installer has experience managing defrost-related comfort complaints. An experienced cold-climate installer will have strategies for this - it is a routine part of heat pump operation in Maine.

"What backup heating do I need?"

In most Maine homes, cold-climate heat pumps handle the vast majority of heating needs. But during the coldest nights of the year, or during power outages, a backup heat source provides security.

An honest installer will discuss backup heating options rather than claiming the heat pump handles everything under all conditions. Options include keeping an existing boiler or furnace as backup, installing electric resistance backup, or sizing the heat pump aggressively enough to handle extreme cold at the cost of oversizing for milder weather.

The right answer depends on your comfort with risk, your existing equipment, and your budget.

About the Business: Questions About the Installer

"Are you licensed for refrigeration work in Maine?"

Heat pump installation involves refrigerant handling, which requires specific licensure in Maine. Ask to see the installer's refrigeration license. An unlicensed installer is not only breaking the law but may void the manufacturer's warranty on the equipment.

"What is your warranty?"

Understand both the manufacturer warranty (typically 10-12 years on compressor and parts for major brands) and the installer's workmanship warranty (which covers the installation itself). Get both in writing.

"How many cold-climate heat pump systems have you installed?"

Experience matters, particularly with cold-climate systems in Maine. An installer with hundreds of cold-climate installations has dealt with the specific challenges of our climate - sizing for extreme cold, managing defrost, snow management at the outdoor unit, and maintaining performance through a full Maine winter. A company new to heat pumps may be learning on your project.

"Do you handle the Efficiency Maine rebate paperwork?"

Efficiency Maine rebates for cold-climate heat pumps can reach up to $9,000 (income-dependent). An experienced installer should be familiar with the rebate process, able to estimate your rebate based on your income tier and system, and willing to handle the paperwork.

At Horizon Homes, we manage the entire Efficiency Maine process and apply the rebate directly to your invoice. You pay the net cost, not the full price with a rebate arriving weeks later.

Putting It All Together

The installer who gives you the best experience and the best system is the one who:

• Does a heat loss calculation specific to your home
• Considers your building envelope condition (insulation, air sealing)
• Recommends cold-climate-rated equipment with published performance data
• Explains their sizing, placement, and unit count decisions clearly
• Discusses backup heating honestly
• Has significant experience with cold-climate installations in Maine
• Handles the rebate process

At Horizon Homes, we bring an additional advantage: because we do both insulation and heat pumps, we can evaluate and improve your building envelope first, then right-size the heat pump for the improved home. This whole-home approach produces better comfort, lower operating costs, and a system designed as an integrated solution rather than an isolated equipment swap. We have been serving Greater Portland homeowners this way since 2006.

Considering cold-climate heat pumps for your home? Schedule your free energy assessment and we will evaluate your home from building envelope to heating system, give you honest recommendations on sequencing and sizing, and provide a clear estimate with rebate calculations.

Or call (207) 221-3221 to ask questions. We are happy to help you think through the decision before you commit to anything.