Heat pumps are the most energy-efficient way to heat your home using electricity. According to EECA (Energy Efficiency and Conservation Authority), a heat pump produces around three times more heat than the electrical energy it consumes, making it significantly cheaper to run than plug-in heaters, gas, or wood burners.
For homeowners, understanding heat pump costs, efficiency, and maintenance can save hundreds of dollars annually and keep your home warmer.
How Much Does a Heat Pump Cost in New Zealand?
Installation costs vary significantly based on unit size, type, and complexity:
| Type | Purchase + Installation | Suitable For |
|---|---|---|
| Small wall-mounted | $2,000-3,500 | Single bedroom or study |
| Standard wall-mounted | $3,500-5,500 | Living areas 20-40sqm |
| Large wall-mounted | $4,500-7,500 | Open-plan areas 40-60sqm |
| Multi-split system | $8,000-15,000 | Multiple rooms |
| Ducted system | $12,000-25,000+ | Whole-house heating |
According to EECA, the average cost including purchase and installation is around $4,400 for a standard single-split system.
Installation costs also vary by complexity. Standard wall installation runs $800-1,500, while high wall or difficult access locations cost $1,200-2,000. Back-to-back installation, where the outdoor unit sits directly behind the indoor unit, is the most economical at $500-1,000.
Book installation during autumn or spring if possible. Many installers offer $200-300 off labour during shoulder seasons when demand is lower.
Running Costs: What to Expect
EECA estimates the average heat pump costs around $600 per year to run for heating and cooling combined. Based on current electricity prices, the hourly running cost is approximately 26 cents. Heat pumps cost 3-16 cents per kWh of heat delivered, compared to 18-40 cents for electric heaters. This translates to annual savings of approximately $120-150 compared to piped gas heating, and significantly more compared to electric heaters.
Heat pumps achieve this efficiency because they don't generate heat - they transfer it from outside air into your home. For every 1kW of electricity consumed, a heat pump delivers 3-4kW of heat. This is measured as the Coefficient of Performance (COP). Look for units with a COP of 3.0 or higher for good efficiency.
Choosing the Right Size
Underpowered heat pumps disappoint. They struggle to heat spaces adequately, run constantly, and wear out faster. Oversized units waste money on unnecessary capacity.
| Room Size | Recommended Output |
|---|---|
| 15-20sqm | 2.5-3.5kW |
| 20-30sqm | 3.5-5.0kW |
| 30-45sqm | 5.0-6.5kW |
| 45-60sqm | 6.5-8.0kW |
| 60sqm+ | 8.0kW+ or ducted system |
These are approximate figures. Actual requirements depend on ceiling height, insulation, window area, and local climate. Get a professional assessment before purchasing.
Optimal Settings for Efficiency
Temperature
Set your heat pump between 18-21°C for comfortable and efficient operation. The World Health Organisation recommends 18°C as the minimum healthy temperature, while 20-21°C is comfortable for most people. Avoid setting temperatures above 24°C, as this dramatically increases running costs. Each degree above 21°C adds roughly 10% to power consumption.
Mode Settings
Heat mode is the most efficient option for heating, maintaining your set temperature consistently. Auto mode switches between heating and cooling but may cycle inefficiently. Dry mode removes humidity without significant heating, which is useful in damp New Zealand conditions. Fan only mode circulates air without heating or cooling and uses minimal power.
Timer Functions
Use the timer to pre-heat your home before you wake or arrive home. Running the heat pump continuously at a low setting is often more efficient than blasting it on high when you're cold.
Maintenance That Saves Money
Filter Cleaning
Clean your filters every 2-4 weeks during winter. Dirty filters force the motor to work harder, reducing efficiency by up to 15% and shortening the unit's lifespan.
To clean the filters, open the front panel and slide out the filters. Vacuum them or rinse with lukewarm water, then allow them to dry completely before reinstalling. You can expect a 2-3°C improvement in heat output after cleaning.
Annual Professional Service
A professional service costing $150-250 annually is worthwhile. A qualified technician will check refrigerant levels, clean the outdoor unit, inspect electrical connections, test all modes and functions, and clear drainage systems. This extends unit life and maintains warranty validity.
Outdoor Unit Maintenance
Keep at least 50cm clearance around the outdoor unit and clear leaves, grass, and debris regularly. Ensure the unit remains level, as this affects drainage and efficiency. In frost-prone areas, check for ice buildup during winter.
Heat Pump Placement
Where you install your heat pump affects how well it heats your home.
For the indoor unit, position it high on the wall so warm air rises and then circulates down. Place it central to the space you want to heat, avoiding locations directly above furniture that blocks airflow. Keep it away from direct sunlight, which affects the temperature sensors.
For the outdoor unit, choose a location sheltered from strong winds and out of direct sun if possible, as this improves efficiency. Install it on a solid, level base where it remains accessible for maintenance. Ground-mounted installation saves $200-500 compared to wall or roof brackets.
Government Grants and Subsidies
Warmer Kiwi Homes
If you own and live in a house built before 2008 and hold a Community Services Card or SuperGold Card, you may qualify for the Warmer Kiwi Homes grant, which can cover 80-90% of heat pump installation costs.
To be eligible, your home must have been built before 2008, you must own and live in the property, you must hold a Community Services Card, SuperGold Card, or live in a designated low-income area, and you must not have previously received a Warmer Kiwi Homes grant for heating. Check eligibility at the EECA website.
Heat Pumps and Your Mortgage
For homeowners, heat pumps represent a solid investment. Modern heat pumps are expected by buyers, and a home without efficient heating may sell for less or take longer to sell.
If you're a landlord or investor, fixed heating capable of achieving 18°C is mandatory under the Healthy Homes Standards. Heat pumps are the most common solution. Learn more in our investor resources.
Heat pump installation can be rolled into renovation loans or topped up on your mortgage during refinancing, spreading the cost over your mortgage term.
Warmth That Pays for Itself
A heat pump costing $4,000-5,000 typically pays for itself within 6-8 years through electricity savings compared to other heating methods. Factor in improved comfort, better health outcomes from warmer homes, and increased property value, and it's one of the smarter home investments you can make.
To get the most from your heat pump, get your existing unit serviced before winter, clean filters every 2-4 weeks during heavy use, and set the temperature to 18-21°C with no higher. If installing a new unit, get professional sizing advice and check Warmer Kiwi Homes eligibility for potential grants.
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