Air source heat pump cost is shaped by the system you choose, the heat your home needs and the work required to install it. A price for a single-room wall-mounted unit, for example, cannot be compared directly with a quote for a whole-home ducted system or an air-to-water unit connected to radiators or underfloor heating. Equipment is only one part of the budget: electrical work, pipe runs, ducting, drainage and removal of an old system may also affect the total. To judge whether a quote suits your home, compare the same scope of work and consider likely running costs alongside the installation price.
A useful quote separates the equipment from the work needed to make it operate safely and effectively. Some installers provide a complete project price; others list optional items separately. Either format can work, provided you can see what is included and what might be charged as an extra.
Ask for the quote to identify the heat pump model and configuration, the number and location of indoor units, and the outdoor unit. It should also explain the proposed installation work, commissioning, controls and warranty coverage. In New Zealand, check whether the amount is in NZ dollars and includes GST.
“Installed” does not always mean the same scope from one quote to another. One contractor may include removal, electrical upgrades and finishing work; another may treat them as provisional or exclude them. Find out which conditions could change the price after work begins, such as concealed damage or difficult access.
Air source heat pumps move heat from outdoor air into a home. The term can refer to different arrangements, and their equipment and installation requirements differ. Start by confirming what kind of system each quote covers; a lower headline price may simply describe a smaller job.
| System type | Typical scope | Cost factors to check | May suit |
|---|---|---|---|
| Single-room split | One indoor unit connected to an outdoor unit | Pipe route, unit position, electrical supply and drainage | A main living area or another clearly defined space |
| Multi-split | Several indoor units connected to an outdoor unit | Number and type of indoor units, pipe lengths, controls and layout | Homes needing separate units in more than one room |
| Ducted air-to-air | One central system distributing heated air through ducts | Duct routes, ceiling or underfloor access, outlets, zoning and insulation | Homes where a whole-home air distribution approach fits the building |
| Air-to-water | An outdoor heat pump supplying a water-based heating system | Compatibility with radiators or underfloor heating, pipework and controls | Homes designed for or already equipped with hydronic heating |
These descriptions are starting points, not a substitute for a heat-loss assessment. A single-room unit may be a sensible way to heat a frequently used area, but it will not automatically provide even temperatures in closed-off rooms. Ducted heating can serve multiple spaces, yet the cost depends on whether the building can accommodate suitable duct routes. An air-to-water system needs a compatible water-based distribution system, so its cost cannot be judged on outdoor-unit price alone.
Correct sizing is central to both the upfront cost and the result. The installer needs to consider how much heat the home loses, not just its floor area. Relevant details can include insulation, windows, ceiling height, room layout, air leakage, local climate and how the household uses each space.
A system that is too small may struggle to maintain the desired temperature during demanding conditions. An oversized unit can add unnecessary equipment cost and may not run as intended. Ask the contractor to explain the basis for the proposed capacity and whether the design accounts for the rooms you expect to heat.
Existing building features can change the installation scope. A straightforward wall-mounted unit may require a short connection between the indoor and outdoor equipment. A long or awkward route, restricted access, multiple storeys or a difficult outdoor location can mean more labour and materials. For ducted systems, the installer may need to assess ceiling or underfloor space, existing ducts and the location of vents and returns.
Home improvements may also be relevant. If the house has significant draughts or poor insulation, discuss whether addressing those issues should happen before choosing equipment. Better performance cannot be assumed from a larger heat pump alone; the design should reflect the building’s actual needs.
Position affects pipe length, access, drainage, noise exposure and how effectively air moves through the room. Ask the installer to show the proposed locations on a plan or during the site visit. Check that furniture, doors and room layout will not obstruct the intended airflow, and discuss where the outdoor unit can be serviced without creating an avoidable nuisance.
The quote should state what electrical work is included and whether the contractor has identified any changes needed to the existing supply or switchboard. Do not assume that the cost of connecting a new unit is covered simply because installation labour is included. Ask who will carry out the electrical work and whether it is included in the total.
For ducted systems, clarify how much ductwork is included, where outlets will be placed, and whether zoning or additional controls are part of the design. For split systems, ask where pipes and condensate drainage will run, and whether visible channels or building repairs are included. These details can make a difference to both the final cost and the appearance of the finished installation.
If an existing heater or heat pump is being removed, confirm who disconnects it, whether removal and disposal are included, and what happens to openings or fittings left behind. Ask how the installer will handle work that cannot be assessed until installation begins. A written explanation of exclusions and approval for extra work can help prevent surprises.
Request itemized quotes based on the same rooms, comfort expectations and system type. If the proposals differ, ask each contractor to explain the difference rather than comparing the totals alone. A site assessment is especially useful when access, building layout or existing heating could affect the design.
Use the same questions with each installer. A quote that explains its design and assumptions is easier to evaluate than a bare total, even if it is not the lowest. Before accepting, make sure the final document reflects the system and work you discussed.
The installation price is only part of the household cost. Electricity use depends on the heat the home needs, the heat pump’s performance in the conditions where it operates, the chosen temperature, operating hours, controls and electricity tariff. Occupancy and the way rooms are used also matter.
For a basic estimate, ask the installer for an expected annual electricity-use figure for the proposed design and the assumptions behind it. You can then multiply that estimate by your own electricity rate to get a rough annual energy cost. Treat the result as an estimate rather than a guarantee: actual use can differ with weather, household habits and the condition of the home.
When comparing equipment, look for the efficiency information relevant to the system and ask how it applies to your climate and intended use. A headline efficiency figure alone cannot predict a bill. Compare estimates based on the same heating needs and operating assumptions, and check whether the proposal relies on the heat pump as the main source of warmth or as support for another heater.
Also ask what routine maintenance the manufacturer recommends, what the warranty covers and whether service visits are included or charged separately. These are separate from the electricity estimate and can affect the longer-term ownership budget.
They may cover different equipment, capacities, rooms or installation work. Differences in access, electrical requirements, pipe routes, ducting and removal of old equipment can also affect the total. Ask both contractors to explain the design and list inclusions and exclusions.
Capacity can affect equipment selection, but it is only one part of the quote. The system type, number of indoor units, installation route and building work also matter. Ask the installer to justify the proposed size using your home’s heating requirements.
It depends on the system design and the layout of the house. A single-room split system is intended to serve a defined area, while ducted or multi-unit arrangements can serve more rooms when designed for that purpose. Ask which spaces are included and what comfort to expect in closed-off or distant rooms.
Request an annual electricity-use estimate for the proposed system, along with the assumptions about heating demand and operation. Multiply that figure by your electricity rate for a rough cost, then remember that actual use will vary with weather, settings and household habits.
Confirm the equipment, rooms served, installation work, electrical requirements, exclusions, extra-work process, commissioning and warranty terms. Make sure any uncertain items have a clear explanation of how they will be assessed and approved.
There is no useful air source heat pump cost figure without knowing the system type, the home’s heating needs and the installation scope. Get itemized, site-specific quotes, compare their assumptions and ask for a realistic estimate of electricity use. That gives you a clearer basis for choosing a system that fits both your home and your budget.
