How much is a 3-room multi-split heat pump in NZ?

Most 3-way multi-splits cost $7,500–$10,000 installed. Rooms close to the outdoor unit and standard high-wall heads sit at the lower end.

Can one outdoor unit run heat pumps in several rooms?

Yes. That is what a multi-split does. Residential outdoor units commonly support two to five indoor units, depending on model and total capacity.

Can I heat one room and cool another with a multi-split?

Not on typical residential systems. All connected indoor units must run in the same mode, according to Consumer NZ.

Is a multi-split cheaper than two separate heat pumps?

For two rooms the price is usually similar. Savings generally start at three rooms, and only if the rooms are not far apart.

What happens if the outdoor unit breaks?

All rooms connected to it lose heating and cooling until it is repaired. Separate single splits avoid that risk.

Can I add another indoor unit later?

Only if your outdoor unit has a spare connection and enough capacity. If you think you will expand, plan for it at quote time.

Multi-Split Heat Pump Cost NZ (2026)

How much does a multi-split heat pump cost in NZ?

Installed prices for a multi-split run from about $5,500 for a two-room system to $18,000 for a five-room system. Most quotes for three rooms, usually a lounge and two bedrooms, fall between $7,500 and $10,000. Prices include the outdoor unit, the indoor units, pipework, electrical connection and commissioning.

Multi-split heat pump prices by number of indoor units (installed, NZD incl. GST)
System	Indoor units	Price range	Typical install time
2-way	2	$5,500–$7,500	About 1 day
3-way	3	$7,500–$10,000	1.5–2 days
4-way	4	$10,000–$14,000	About 2 days
5-way	5	$13,000–$18,000	2+ days

Prices and timings from Airmax, July 2026. Top5.nz reports $5,000–$12,000 for 2–5 units (typical $8,500), and Varcoe quotes roughly $4,000–$7,000 for multi-room systems. Quotes vary with brand, unit sizes and pipe lengths.

The spread between sources is real. Smaller indoor units in rooms next to each other sit at the low end. Larger living-room units, premium brands, or bedrooms on the far side of the house push toward the top.

What is a multi-split, and who is it for?

A multi-split connects one outdoor unit to two or more indoor units, each with its own controls. It suits homes that want to heat a few specific rooms, have limited space outside for multiple outdoor units, or where the owner would rather see one outdoor unit than three.

Indoor units can be a mix of high-wall, floor console, ceiling cassette or small ducted heads, depending on the brand. That flexibility helps in older homes where a wall unit would sit awkwardly above a fireplace or picture rail.

Is a multi-split cheaper than separate heat pumps?

For two rooms, usually not by much. Two separate small high-wall splits cost around $5,000–$7,000 installed, which overlaps a 2-way multi-split. From three rooms, a multi-split tends to save $1,500–$3,000, and the savings grow with four or five rooms, provided pipe runs stay reasonable.

Multi-split vs separate single splits (installed, NZD incl. GST)
Rooms	Separate single splits	Multi-split	Likely saving
2	$5,000–$7,000	$5,500–$7,500	Little or none
3	$7,500–$10,500	$7,500–$10,000	$1,500–$3,000
4	$10,000–$14,000	$10,000–$14,000	$2,000–$4,000
5	$12,500–$17,500	$13,000–$18,000	$2,500–$5,000

Single-split column uses $2,500–$3,500 per small-room unit from Top5.nz; larger living-room units cost more. Saving estimates from Airmax, which compares like-for-like room sizes. Raw ranges overlap because each source prices different unit sizes.

Separate splits have advantages a price table does not show. Each room runs on its own outdoor unit, so one failure does not leave the whole house cold, and each unit can be sized exactly for its room. Separate units can also run in different modes at once.

What pushes a multi-split quote up?

Pipe length is the main variable. Every indoor unit needs its own refrigerant pipes and cable back to the outdoor unit, so rooms at opposite ends of the house cost far more to connect than rooms stacked side by side.

Pipe runs. Extra refrigerant pipe beyond the standard allowance costs about $50–$80 per metre (Top5.nz). Each system also has a maximum total and per-room pipe length set by the manufacturer.
Indoor unit types. Floor consoles and ceiling cassettes cost more than high-wall heads, and hidden ducted heads cost more again.
Access. Two-storey homes, concrete slabs and finished interiors make it harder to hide pipes. Exposed trunking on outside walls is cheaper but more visible.
Unit sizes. A 6 kW living-room head costs more than a 2.5 kW bedroom head, and the outdoor unit has to be big enough for the combination.
Electrical work. A larger outdoor unit may need a new dedicated circuit or a switchboard upgrade.
Brand. Premium brands usually cost more up front. Compare on capacity, efficiency and warranty, not badge alone. See our brand guides.

What are the downsides of a multi-split?

The main limits are that all rooms share one outdoor unit and one operating mode. Consumer NZ points out that a multi-split cannot heat one room while cooling another, and if the outdoor unit fails every connected room loses heating at once.

One mode at a time. On typical residential systems, rooms cannot be heating and cooling simultaneously (Consumer NZ).
Single point of failure. A fault or service on the outdoor unit affects every room.
Part-load efficiency. Running one small bedroom head on a large outdoor unit can be less efficient than a small dedicated split. Ask how the system performs with only one room on.
Pipe length limits. Rooms too far from the outdoor unit may exceed the manufacturer's limits, forcing a second system anyway.
Future changes. Adding a room later is only possible if the outdoor unit has spare ports and capacity.

How do multi-split running costs compare?

Running costs depend on how much heat each room needs, not the system type. Heating three rooms with a multi-split uses roughly the same energy as three equivalent single splits, with small differences either way depending on part-load efficiency. Size each room with the size calculator, then use the formula in how much a heat pump costs to run.

Should you choose multi-split or ducted?

Choose a multi-split when you want three or four specific rooms heated for the lowest price and do not mind seeing units in each room. Choose ducted when you want the whole home heated evenly with only grilles visible, and your ceiling or floor space allows it. Ducted systems in standard homes usually cost $8,000–$15,000 or more. See ducted heat pumps and the ducted cost guide.

Multi-split heat pump cost NZ (2026)