A typical Maine heat pump uses somewhere between 1,900 and 4,900 kWh a year for heating, depending on how much of the house it heats. That is roughly 5 to 13 kWh per day averaged over the year, with most of it burned in December through March. Your own number depends on your home, your setup and how much oil, propane or electric baseboard the heat pump replaces. Below are the real figures, a formula for estimating your own, and the steps that keep the number low.
TL;DR
- Efficiency Maine's 2024 impact evaluation found the average rebated heat pump used 1,887 kWh a year for heating. Its 2026 whole-home study found 4,904 kWh in homes leaning on heat pumps more heavily.
- Use is seasonal. Expect most of the annual kWh in the cold months, and a modest draw in summer if you cool.
- Your electric bill goes up when a heat pump takes over heating, but the fuel bill it replaces usually goes down by more.
- Right sizing, sensible settings and annual cleaning are the main levers you control.
Table of Contents
- How many kWh does a heat pump use in Maine?
- Why the range is so wide
- How to estimate your own kWh
- Mini split power consumption
- Why your electric bill rises after installation
- Energy savings and payback in Maine
- How to keep heat pump electricity use down
- Our perspective
- Get your numbers checked
- FAQ
- Sources
How many kWh does a heat pump use in Maine?
Two Efficiency Maine studies give the best local picture, and they measure different things.
The 2024 evaluation covers rebated installations from December 2019 through June 2021. It reports that the average heat pump used 1,887 kWh per year for heating, with a mean seasonal COP of 2.57. Nearly 40% of units used under 1,000 kWh a year, and nearly 25% used more than 3,000 kWh. Many of those early installs were a single indoor unit supplementing an existing system, so the spread is wide.
The 2026 study looks at homes in the Whole Home Heat Pump program, with data from September 2023 through February 2024. These homes use 4,904 kWh a year on average for heating with heat pumps. The study ties the higher electricity use per unit of capacity to heavier utilization, meaning the heat pumps are displacing more fossil fuel, rather than to poor efficiency.
Here is what those averages look like in daily and monthly terms. This is simple division on our part, and real use is not flat across the year.
| Scenario | kWh per year | Average kWh per day | Average kWh per month |
|---|---|---|---|
| Average rebated heat pump (2024 evaluation) | 1,887 | about 5.2 | about 157 |
| Whole-home program average (2026 study) | 4,904 | about 13.4 | about 409 |
A January day will run well above those averages, and a July day will run far below. If you want a figure for a specific month, scale by the weather: colder months mean longer run time.
Why the range is so wide
The same technology produces very different totals because the jobs differ. A single ductless head heating a living area is a small job. A multi-zone or ducted system heating a whole house through a Maine winter is a large one. Four things set the total:
- How much of the house it heats. Homes that rely on heat pumps for most of their heat use more kWh, and they displace more fuel.
- The building. Insulation, air sealing and window quality decide how many BTUs the house loses per hour. A NEEP market report found savings of about 3,000 kWh per year on average when heat pumps offset electric resistance heat, with a tremendous range between homes. Building-specific factors drive that range.
- Thermostat habits. Holding 72°F in every room uses more than heating the rooms you live in.
- Outdoor temperature. Efficiency falls as it gets colder, so each unit of heat costs more electricity in a deep freeze than in March.
How to estimate your own kWh
The formula is straightforward: watts × hours ÷ 1,000 = kWh. Find the rated input power on the outdoor unit's nameplate (or multiply amps by volts to get watts), then estimate hours of actual run time.
A heat pump rarely runs at full power. Inverter systems modulate, so the average draw sits well below the nameplate maximum. Treat nameplate math as an upper bound, not a forecast.
A more realistic approach for a Maine home is to work from the studies above:
- Pick the study average closest to your setup: about 1,900 kWh for a partial-load system, about 4,900 kWh for a whole-home system.
- Multiply by your electric rate. Efficiency Maine's rebate brochure uses $0.26 per kWh in its example. Your bill shows your actual delivered rate.
- At $0.26, 1,887 kWh comes to about $491 a year, and 4,904 kWh comes to about $1,275 a year. That is our arithmetic, not a quote.
- Compare that with what you spent last winter on oil, propane, pellets, wood or electric baseboard.
Step 4 is the one that matters. The electric number alone is only half the picture.
Mini split power consumption
A mini split is a ductless heat pump, so everything above applies. A few details are specific to ductless equipment.
Inverter compressors change speed to match the load. A long-term monitoring study of mini-splits in the Northeast found that in a cold climate, heating consumption far outweighs cooling consumption. The same study noted that units were often oversized by 150% to 200% compared with calculated loads, and that modulating units reach their highest efficiency at the lower end of their capacity range.
That last point is easy to misread. It does not mean bigger is always better. Oversizing past what the heat loss supports can still waste money up front, and capacity in a cold snap is what keeps comfort up. The right answer is a unit chosen from a real heat-loss calculation for each zone. Our guide to sizing and commissioning inverter heat pumps for cold climates walks through how that works, and the floor-mounted mini split page covers a model that keeps heating at very low temperatures.
Ratings help you compare efficiency before you buy. Our explainer on SEER2 versus HSPF2 shows which number matters for a Maine heating season (HSPF2 for heating, SEER2 for cooling).
Why your electric bill rises after installation
The jump is real, and it is expected. When a heat pump takes over heating from oil or propane, the energy moves from a fuel tank to your electric meter. A University of Maine SPIR(E) analysis of 155 northeastern homes that installed a single heat pump found a typical rise of about 25% in electricity use. The average change was 22% and the median 28%. Results varied hugely, from a 69% decrease to a 490% increase, because some households barely used the unit and others heated much of the house with it.
Three causes of a higher-than-expected bill come up most often.
Cold-weather efficiency drops. One utility notes that heat pump efficiency begins to fall below 40°F and that longer heating runs raise bills. Cold-climate models are built to hold capacity and efficiency much better at low temperatures than standard units, which is why equipment choice matters in Maine.
Backup heat running too often. The same utility says auxiliary electric heat can use three times the electricity of the heat pump itself. Where a home has electric backup strips, the control settings decide how often they fire. In Maine homes with oil or propane backup, the lockout setting decides when the heat pump hands off. See our guide to the heat pump lockout temperature for how to set it, and our overview of dual fuel heat pumps for when that pairing fits.
Heating more of the house. Once a heat pump is comfortable and quiet, people tend to use it more. That is a good outcome as long as the fuel it replaces drops with it.
Energy savings and payback in Maine
Electricity use only tells you what the heat pump costs. Savings come from what it displaces.
Efficiency Maine's 2024 evaluation reports heat pumps saved the equivalent of 2,988 kWh versus an electric baseline and 14.4 MMBtu versus an 80%-efficient fossil system. Rebated installations displaced natural gas, fuel oil, propane, pellets and cordwood.
The agency's statewide planning estimate is that a typical Maine home heated entirely with heat pumps will save, on average, more than $600 per year on its heating bill compared with its prior arrangement.
For payback, Efficiency Maine's rebate brochure gives an example of $1,319 a year saved heating with heat pumps versus propane. It shows payback of 3.0 years for low-income households, 4.5 years for moderate income and 6.1 years for any income. The example assumes electricity at $0.26 per kWh and a heat pump COP of 3.15. Those are example assumptions, so treat them as a model of how the math works.
To run it for your house:
- Upfront cost: the installed price of the system, minus rebates you qualify for. Our Maine rebates page explains eligibility.
- Annual savings: last year's fuel spend, minus the added electricity from the heat pump.
- Simple payback: net upfront cost divided by annual savings.
Fuel prices move, so rerun the numbers with current prices before you decide.
How to keep heat pump electricity use down
These steps cost little and compound across a winter.
- Start with a heat-loss calculation. A system matched to the home's actual load runs in its efficient range more of the time.
- Pick equipment rated for Maine winters. Look for cold-climate models with strong low-temperature capacity.
- Set the thermostat once and leave it. Heat pumps do best with steady setpoints. Big overnight setbacks can trigger backup heat on recovery.
- Keep airflow clear. Dirty filters and coils force longer run times. Keep snow and ice away from the outdoor unit. If you are thinking about a cover, read our note on heat pump covers for winter first.
- Seal and insulate. Every BTU you stop losing is a kWh you do not buy.
- Service the system yearly. Clean coils and indoor components help the unit move heat with less effort.
- Check the lifespan outlook. A well-kept system keeps delivering for years, and our guide to heat pump lifespan in Maine covers what to expect.
Our perspective
Most of the worry we hear about heat pump electricity comes from one missing step: nobody did a heat-loss calculation. When a system is sized to the house, the right zones are heated and the controls are set for a Maine winter, the kWh you use are the ones doing useful work.
We design for the cold. Our systems are built around equipment that is designed to keep working when temperatures plunge to −22°F or lower, and we size each one from the home's own heat loss, not a rule of thumb. That is how a heat pump keeps pulling heat from cold air instead of leaning on expensive backup.
We also think the electric bill should never be judged alone. Put it next to the oil, propane or pellet spend it replaces, then subtract rebates. We help homeowners sort out rebate eligibility and plan the system so the whole picture makes sense before a single unit goes in.
After installation, the biggest gains come from care. Clean coils, clear airflow and a proactive annual visit keep a system running efficiently for the long run. That is why we offer annual care plans.
John
Get your numbers checked
If you want a figure for your own house instead of a statewide average, we start with a free assessment and estimate. We confirm service by ZIP code before any appointment or payment. We install new systems, replace existing ones and handle preventive maintenance and troubleshooting. You can see our installation planning page for how a project runs.
If you already have a heat pump, our one-time deep cleaning starts at $249. The Annual Cleaning Plan is $219 per year, and the Maine Heat Pump Care Plan is $319 per year. Plan details are on the care plan terms page. Start at Hita Maine to ask about your address.
FAQ
How much electricity does a heat pump use per day?
In Maine, annual averages work out to about 5 kWh a day for the average rebated heat pump and about 13 kWh a day for homes in the whole-home program, based on the Efficiency Maine studies above. A deep-winter day uses much more than that, and a summer day much less. Your home's number depends on how much of it the system heats.
How much does it cost to run a heat pump for a month?
Multiply the monthly kWh by your delivered rate. At the $0.26 per kWh used in Efficiency Maine's example, 400 kWh costs about $104. A cold January will run higher than that and a shoulder month lower. Compare the result with the fuel you would otherwise burn that month.
Why is my electric bill so high with a heat pump?
Usually because the heat pump now carries heat that used to come from a fuel tank, so the cost moved to your meter. Long cold-weather runs and frequent backup heat add to it. Checking your backup and lockout settings is the first step, and a technician can review sizing and controls.
Do mini splits use less electricity than other heat pumps?
A single ductless unit heating one zone uses less than a whole-home system because it does a smaller job. Per unit of heat delivered, efficiency depends on the model, the climate and how well the unit is sized, not on the format alone.
How long is the payback period for a heat pump in Maine?
Efficiency Maine's brochure example shows 3.0 to 6.1 years against propane, depending on income level and rebates. Your own payback depends on installed cost, rebates and the fuel you replace, so run it with your own bills.
Sources
- Efficiency Maine: 2024 Residential Heat Pump Impact Evaluation Report
- Efficiency Maine: Assessment of Heat Pumps in Maine Homes (2026)
- Efficiency Maine: Heat pump rebate brochure
- Efficiency Maine: Triennial Plan VI approved
- University of Maine SPIR(E): How much additional electricity will a heat pump use?
- NEEP: Northeast/Mid-Atlantic Air-Source Heat Pump Market Strategies Report
- Long-term monitoring of mini-split ductless heat pumps in the Northeast
- Middle Tennessee Electric: Cold weather bills