How Much Does a Heat Pump Cost to Run per Hour in NZ? (2026 Guide)
A heat pump in Palmerston North costs roughly 20 to 90 cents an hour to run, and where you land in that range comes down to the size of the unit, the size of the room, and how cold it is outside. A small bedroom unit ticking over on a mild evening sits at the bottom. A 12.5kW ducted system heating a whole house through a frosty July morning sits at the top. Here’s the 2026 breakdown, unit by unit, so you know what you’re paying for warmth this winter.
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What’s New in Heat Pump Running Costs for 2026
Power prices have crept up again this year. The national average residential rate now sits close to 35 cents per kWh including GST, and lines charges are most of that rise. The upside is that the units we’re installing now, Daikin’s Cora range and Carrier’s Aspire series among them, squeeze more heat out of every kilowatt than the heat pumps most Palmerston North homes are replacing. If you hold a Community Services Card or SuperGold Combo card, check whether you qualify for EECA’s Warmer Kiwi Homes grant too, currently a 90 percent contribution up to $3,450 towards a high wall unit. It covers high wall systems only, not ducted or floor console installs.
Why a Heat Pump Beats Every Other Electric Heater
At around 35 cents per kWh including GST, a 1kW heater running flat out for an hour costs about 35 cents. A heat pump almost never costs that much for the same warmth, because it doesn’t generate heat the way a panel heater or an oil column heater does. It moves heat, pulling warmth out of the air outside, even on a cold Manawatū morning, and concentrating it indoors. For every unit of electricity it uses, a well-sized heat pump delivers three to four units of heat. That’s why a 2kW panel heater running for an hour costs around 70 cents at today’s prices, while a heat pump putting out the same warmth costs a fraction of that. A plug-in heater in the coldest room is nearly always the pricier habit, even though the heater itself is cheaper to buy.
What a Frosty Manawatū Morning Does to the Final Figure
Heat pump ratings are measured in mild lab conditions, and every unit loses some capacity as the temperature outside drops. On a minus 2 degree morning, a unit rated at 6kW might only be delivering 5kW, working harder and drawing more power to make up the difference. You’ll also hear a defrost cycle kick in every so often, a short pause where the unit reverses briefly to clear ice off the outdoor coil. That’s normal, and it’s why your heat pump costs the most to run on the coldest morning of the year, not on a mild autumn evening.
Cost per Hour by System: Bedroom to Whole-Home Ducted
Here’s roughly what each system costs to run per hour at today’s power prices. Treat these as planning numbers, your actual cost depends on insulation, ceiling height and how hard the unit is working that day.
| System | Typical Electrical Draw | Cost per Hour |
| Bedroom high wall (2.5 – 3.3kW heating) | 0.6 – 0.9kW | 21c – 32c |
| Living area high wall (5.0 – 6.0kW heating) | 1.3 – 1.7kW | 46c – 60c |
| Two-head multi-split, both running | 1.6 – 2.0kW | 56c – 70c |
| Whole-home ducted (6.0 – 12.5kW heating) | 1.7 – 3.5kW | 60c – $1.23 |
A bedroom unit like the Daikin Cora and Carrier Aspire models we install from $1,750 sits at the cheap end because it’s only heating one small room. A 12.5kW whole-home ducted heat pump sits at the top of the range because it’s heating an entire house at once, which is a very different job to warming a single bedroom.
What That Looks Like over a Week of Winter
Run a living-area unit for five hours every evening through a cold snap and you’re looking at roughly $2.50 to $3 a day, around $17 to $20 a week. A bedroom unit left on low overnight is closer to $2 a night. Compare that with two or three plug-in heaters running the same hours, and the heat pump comes out well ahead over a winter.
Five Ways to Keep Your Running Cost Down
A well-installed heat pump is already the cheapest way to heat a Manawatū home. These habits keep it that way.
- Pick a steady temperature and leave it. Aim for 20 to 21°C rather than blasting it to 26°C and switching off. Every degree above that adds meaningfully to what you’re using.
- Close doors. A heat pump warms the room it’s in, not the hallway and three bedrooms beyond it.
- Clean the filters every two to three months. A clogged filter makes the fan work harder for less warmth.
- Get the size right from the start. An undersized unit runs flat out and still leaves the room cold, while an oversized one short cycles and wastes power. We cover the maths in our heat pump sizing guide.
- Book a professional service once a year, ideally before winter. Ours is $249 including GST and takes about an hour, and it’s the difference between a unit running efficiently and one quietly losing its edge.
Heat Pump Running Cost FAQs
How Much Does It Cost to Run a Heat Pump per Hour in NZ?
Most households pay somewhere between 20 and 90 cents an hour, depending on the size of the unit and the room it’s heating. A bedroom unit on a mild evening sits near the bottom, and a large ducted system on a frosty morning sits near the top.
Is It Cheaper to Leave a Heat Pump Running All Day?
For most homes, yes. Heat pumps use more power bringing a cold room up to temperature than they do holding a steady one, so a lower setting while you’re out usually beats switching it off and cranking it back up later.
How Much Does a 6kW Heat Pump Cost to Run?
A typical 6kW living-area unit draws around 1.5 to 1.7kW of electricity, working out to roughly 50 to 60 cents an hour at current prices, and a bit higher on frosty mornings.
Do Ducted Systems Cost More to Run Than a High Wall Unit?
Per room, not really. Ducted systems cost more in total because they’re heating the whole house at once, but the cost per square metre is usually similar to, or better than, running several high wall units to do the same job.
How Can I Bring My Heat Pump’s Running Cost Down?
Keep the temperature steady around 20 to 21°C, close doors, clean the filters every couple of months, and book an annual service. Getting the size right at installation matters just as much as any habit afterwards.
Verdict on Heat Pump Running Costs
At today’s prices, a well-sized heat pump is still the cheapest way to heat a Palmerston North home, and the exact cents-per-hour figure matters less than getting the installation right in the first place. A unit that’s sized correctly, installed with a clean back-to-back pipe run and serviced once a year costs close to the low end of every range above. One that’s guessed at, sized off whatever was on the van, sits at the high end no matter how efficient the box says it is on the sticker. If you want a real figure for your own home rather than a rough band, our free site assessment gives you a fixed heat-load calculation and an honest answer on which system suits your budget.