For most Christchurch and wider Canterbury homes, a modern heat pump costs about 20 – 60 cents per hour to run. A small split-system ticking over on a mild day sits at the lower end; a large ducted unit heating the whole house on a frosty night sits at the upper end. EAC specialise in servicing heat pumps across Christchurch.
Below we break down how those numbers are worked out, compare the main heat pump types, and share simple tips to keep your hourly running cost as low as possible.
Christchurch’s electricity prices – The key starting point
Electricity is the biggest part of any running-cost equation. The latest Quarterly Survey of Domestic Electricity Prices lists the average retail price in Christchurch at 31.3 c/kWh (May 2024). That’s lower than many North Island centres, giving us a head start on affordable heating and cooling.
Why heat pumps are still the cheapest electric heater
Heat pumps don’t generate heat; they move it. For every kilowatt of power they use, they typically deliver three to four kilowatts of heat. EECA research even shows split systems can deliver warmth for as little as 5-7 c per kWh of heat. In practice that means:
| Typical electrical input | Cost per hour (31.3 c/kWh) | Heat delivered (COP 3.5) |
| 0.6 kW (small bedroom) | ~19 c/h | ≈ 2.1 kW |
| 1.3 kW (lounge) | ~41 c/h | ≈ 4.5 kW |
| 2.5 kW (whole-home ducted) | ~78 c/h | ≈ 8.8 kW |
Even that top-end figure is cheaper than running three 2 kW column heaters, which would chew through $1.88 per hour on the same tariff.
The Canterbury climate factor
Winter daytime highs in Christchurch usually hover between 7 °C and 14 °C, with regular overnight frosts. Summer afternoons average 21 °C-22 °C. Because heat pumps both heat and cool efficiently, locals rely on them throughout the year. Hourly costs rise on the coldest mornings and hottest nor’west days, but smart settings can keep bills in check.
How each heat-pump type stacks up
Single split-system
One outdoor + one indoor unit
- Small bedroom/office: 15 – 25 c/h
- Large lounge: 35 – 55 c/h
Multi-split
One outdoor and two-to-five indoor heads
- Running one head = split-system costs above
- Two heads at once: ≈ 45 – 70 c/h
- Three heads: ≈ 60 – 85 c/h
Ducted
Central unit + ceiling ducts
- Whole-home heating or cooling: ≈ 60 – 90 c/h
Figures assume well-sized, inverter-driven units from efficient brands. Real-world tests place the average running cost of NZ split systems around 26 cents per kWh of heat produced, which matches the table above once power tariffs are applied.
Four ways to keep that figure at the low end
- Choose an efficient brand and the right size
Mitsubishi, Fujitsu and Gree all carry multiple Energy-Star models. Oversized or undersized units burn more power than necessary. - Aim for sensible set-points
Set heat to 18-21 °C in winter and set cool to 23-25 °C in summer. Each degree beyond that can bump consumption by 6-8%. - Clean filters and book an annual service
Dirty coils force the compressor to work harder and can add tens of dollars to a monthly bill. Annual servicing typically costs less than $120 and pays for itself quickly. - Use timers and zoning
Program the lounge unit to start 30 minutes before you wake, then switch to bedroom heads at night. Close doors or ducted zones in rooms you’re not using.
Typical impact on your monthly bills
A Canterbury family running a 6 kW high-wall unit for 6 hours a day in July might spend:
6 h × 50 c/h ≈ $3 a day → about $90 for a 30-day month. Swap that for three portable heaters, and you could double that figure.
Ready for lower power bills? Talk to EAC
EAC has 25 years of local expertise installing and servicing heat pumps across Christchurch and Canterbury. Our consultants size each system to your home, explain running-cost expectations up front, and keep your unit performing at peak efficiency for the long haul.
Call 03 359 9555 or message us today for a free consultation and discover how little comfort really costs with an EAC-installed heat pump.