Large open plan heat pump package, installed
For spaces our calculator sizes between 7 and 10 kW: an open-plan area of about 54 to 76 m² in a mild climate, or 45 to 64 m² in a cold one. You get an 8 or 9 kW high-wall heat pump, a standard back-to-back install and the electrical certificate. Top5.nz puts a large open-plan install at $4,500 to $6,500.
Is this the right size?
- Calculator result
- 7 to 10 kW
- Unit fitted
- 8.0 or 9.0 kW high-wall
- Rooms, mild or moderate climate
- about 54 to 76 m²
- Rooms, cold climate (zones 5–6)
- about 45 to 64 m²
- Suits
- Large open-plan kitchen, living and dining spaces with a clear line for airflow
| Floor area | Mild or moderate | Cold (zones 5–6) |
|---|---|---|
| 45 m² | 5.9 kW | 7.0 kW ✓ |
| 50 m² | 6.5 kW | 7.8 kW ✓ |
| 60 m² | 7.8 kW ✓ | 9.4 kW ✓ |
| 70 m² | 9.1 kW ✓ | 10.9 kW |
✓ = this package. High studs and no insulation raise the figure; use the calculator for your room.
Included in the price
- Indoor unit. High-wall unit mounted on an external wall of the room
- Outdoor unit. Ground-mounted on a pad or brackets directly behind the indoor unit (back-to-back)
- Refrigerant pipe. Up to 3 metres, insulated, with the wall penetration sealed
- Pipe capping. Up to 2 metres of cover on the outside wall
- Condensate drain. Up to 4 metres to a suitable drain point
- Electrical. Up to 15 metres of cable to the switchboard, a single-storey run, and the electrical certificate
- Commissioning. Pressure test, vacuum, gas charge check, test run and a walk-through of the remote
- Warranty. Manufacturer's warranty registered in your name; the installer's workmanship warranty passed to you in writing
Allowances follow the published NZ standard back-to-back definition (Harvey Norman NZ) until our installer's are agreed.
Extras, only if the site check finds them
- Extra refrigerant pipe beyond 3 metres: $50–$80 per metre
- Outdoor unit on a roof, high wall bracket or second storey: Priced at the site check
- Pipe run through the roof space or under the floor: Priced at the site check
- New circuit or switchboard work: Priced at the site check
- Removing an old heat pump: Priced at the site check
How booking works
Book online
Room, install details and contact, then a $200 refundable deposit.
Site check
Our installer checks the wall, pipe run and switchboard, in person or from your photos.
Confirmed price
Standard install: the price stands. Extras: priced in writing. Accept, or cancel for a full refund.
Install and certificate
Fitted and commissioned with the electrical certificate. The balance is invoiced after, deposit credited.
Brands
You choose a brand preference when you book, from the range our installer supplies: Mitsubishi Electric, Daikin, Panasonic, Fujitsu (GENERAL AIRSTAGE), Toshiba, Hitachi. The model and its rated heating output are confirmed before you accept.
Where you can book
- Auckland · waitlist
- Wellington · waitlist
- Christchurch · waitlist
- Hamilton · waitlist
- Tauranga · waitlist
- Dunedin · waitlist
- Palmerston North · waitlist
- Napier & Hastings · waitlist
- Nelson · waitlist
- Rotorua · waitlist
- Whangārei · waitlist
- New Plymouth · waitlist
- Invercargill · waitlist
- Queenstown · waitlist
- Central Otago · waitlist
Large open plan questions
When is one big unit the wrong choice?
When the space is L-shaped or broken up, or the calculator says 10 kW or more. One high-wall unit can't push air round corners, so we'll suggest a multi-split or ducted system on a custom quote instead.
How much does a large heat pump cost installed?
Top5.nz's August 2026 guide puts a large open-plan high-wall install at $4,500 to $6,500, typically $5,500. Our fixed price is published once the installer for your region is contracted.
Does a large unit need a bigger electrical supply?
Larger units draw more current and some need their own circuit. The installer's site check looks at your switchboard; any electrical work beyond the standard install is priced before you accept.
Is a large heat pump loud outside?
Larger outdoor units are louder, and councils set noise limits at the boundary. The site check picks a position that meets them. See noise and council rules.
Tell us the room. We'll tell you the size, the price and exactly what's included.
Size the room in two minutes. You see the kW, the package it needs and the standard install spelled out. Ducted, several rooms or a tricky wall? Ask for a custom quote.