Overview: the role of a heat pump installer
A heat pump installer is the tradesperson who fits a heat pump system into your home and makes sure it works safely and efficiently. In New Zealand, that usually means installing both the indoor and outdoor units, connecting the piping and drainage, arranging the electrical connection through a licensed electrician if required, and commissioning the system so it performs properly.
People often assume a heat pump installer simply drills a hole and mounts the unit. In reality, a good installer is responsible for much more than the visible hardware. They need to think about room size, insulation, airflow, noise, outdoor placement, condensate drainage, electrical load, and how the unit will cope with NZ conditions such as damp winters, salty coastal air, and summer heat spikes.
What a heat pump installer actually does
The exact scope depends on the company and the type of system, but most heat pump installation work includes some or all of the following:
- visiting the site and assessing where the unit should go
- recommending a system size and configuration suitable for the room or home
- confirming there is enough wall strength and clear airflow around the unit
- positioning the outdoor unit to allow ventilation, servicing access, and reduced noise
- drilling through the wall for refrigerant pipework and condensate drainage
- mounting the indoor head unit and outdoor condenser on brackets, pads, or a slab
- running and insulating refrigerant pipework
- installing condensate drainage so water does not leak into the house or onto paths
- coordinating the electrical connection with a registered electrician if needed
- pressure testing, evacuating, and commissioning the system
- checking operation, remote settings, and user controls
- cleaning up and explaining basic maintenance to the homeowner
For ducted systems, floor consoles, multi-split systems, or commercial jobs, the work can be more complex and may involve ceiling space access, ducting, condensate pumps, roof access, and more detailed commissioning.
Typical heat pump jobs homeowners hire them for
Homeowners usually call a heat pump installer for one of these jobs:
| Job type | What it involves | Notes for NZ homes |
|---|---|---|
| New heat pump installation | Fitting a complete new system | Common in colder parts of the country and in homes that rely on plug-in heaters |
| Replacement of an old unit | Removing an existing system and installing a new one | Often involves upgrading to a more efficient model |
| Multi-room or multi-split installation | One outdoor unit connected to multiple indoor units | Useful in larger homes, but planning is more important |
| Ducted system installation | Distributing air through ducts in the ceiling or floor | Often chosen during renovations or new builds |
| Relocation of an existing heat pump | Moving a unit to a better position | Not always cost-effective if pipe lengths or capacity become an issue |
| Servicing or fault-finding | Checking poor performance, leaks, noise, or controls | Some issues are electrical or refrigerant-related and need the right licence |
What happens during a site visit
A proper installer should not just quote from a photo if the job is anything more than a simple replacement. A site visit helps them assess:
- room size and layout
- ceiling height and insulation level
- sun exposure and draughts
- where furniture or curtains may block airflow
- wall construction and whether drilling is straightforward
- where the outdoor unit can sit without disturbing neighbours
- how noise will affect bedrooms, decks, or boundary lines
- how the condensate will drain away
- whether the switchboard and power supply can handle the load
This step matters because a heat pump that is too small, too large, or badly placed can short cycle, run inefficiently, create unnecessary noise, or fail to heat the room properly in winter.
How installation works in practice
A standard wall-mounted split-system installation usually follows a fairly predictable programme:
- Planning and marking out – the installer chooses the best indoor and outdoor positions.
- Mounting the indoor unit – a bracket is fixed securely to the wall.
- Installing the outdoor unit – this may be on a wall bracket, ground stand, or concrete pad.
- Drilling the service hole – usually through an external wall for pipework and drainage.
- Running the pipes and drain – refrigerant lines are insulated and protected.
- Electrical connection – a licensed electrician may be needed to supply and connect power.
- Evacuation and testing – the refrigerant circuit is checked for leaks and moisture.
- Commissioning – the installer tests heating, cooling, fan, and remote functions.
- Handover – the homeowner is shown how to use filters, modes, timers, and settings.
In New Zealand, this is often done in one day for a straightforward replacement, but a new install may take longer if the site is difficult, access is tight, or extra electrical or building work is required.
Skills and licences: who does what?
Heat pump installation can overlap with several trades, but the legal responsibilities are different. This is where homeowners often get confused.
| Trade | Main role | NZ regulatory point |
|---|---|---|
| Heat pump installer | Fits and commissions the heat pump system | May need refrigerant handling competence and industry experience |
| Electrician | Provides and connects the electrical supply | Electrical work is regulated by the EWRB; use a registered electrician for prescribed work |
| Plumber | Handles water supply and fixtures | Plumbing is restricted work under the PGDB |
| Gasfitter | Works on gas appliances and pipework | Gasfitting is restricted work under the PGDB |
| Builder | Handles framing, bracing, wall changes, or structural mounting | Building work may need a building consent from the local council |
A heat pump installer is not automatically qualified to do every one of these tasks. For example, if the job needs a new circuit, switchboard upgrade, or hardwired connection, that electrical work must be done by the right person. If there is major wall alteration, structural support, or a new external platform, a builder may be required. If a project involves more than the usual installation footprint, check whether council consent is needed.
What a good installer should advise on
A trustworthy installer should help you make sensible decisions, not just sell the biggest system they can.
They should be able to advise on:
- sizing: choosing a unit suitable for the room, insulation, and local climate
- placement: avoiding noise issues, airflow blockages, and poor drainage
- efficiency: matching the unit to how your household actually uses the space
- access: making sure filters and service panels can be reached later
- moisture control: reducing condensation and mould risk in damp NZ homes
- servicing: how often filters should be cleaned and when a professional service is worthwhile
A heat pump that is installed neatly but badly chosen can still perform poorly. That is why advice matters as much as the physical work.
How heat pump installers differ from electricians, builders, and plumbers
The installer’s role sits in the middle of several trades, but it is not the same as any of them.
- Versus an electrician: the electrician handles the electrical supply, isolator, cabling, and compliance for electrical work. The heat pump installer focuses on the mechanical installation and commissioning of the unit itself.
- Versus a builder: the builder deals with wall modifications, framing, weatherproofing changes, and structural supports. The installer usually works within the existing opening or mounting area.
- Versus a plumber: plumbers handle water services and plumbing fixtures. A heat pump installer may deal with condensate drainage, but that is not the same as general plumbing.
- Versus a gasfitter: gasfitters work on gas appliances; heat pumps do not use gas for heating.
In some companies, one trade may not be enough for the whole job. On a renovation, for example, the installer may need to coordinate with an electrician and builder to complete the work safely and legally.
Signs you are hiring the right person
When comparing quotes, do not just look at the bottom line. Ask what is included and who will do each part of the job.
A reliable heat pump installer should:
- provide a written quote with a clear scope of work
- explain what is and is not included, including electrical work and disposal of old units
- be upfront about any access issues or extra costs
- suggest an appropriately sized system rather than automatically upselling
- be comfortable explaining how they will handle drainage, noise, and condensate
- show evidence of relevant experience, insurance, and any required registrations or licences for the parts of the job they perform
It is wise to get at least two or three written quotes, especially for multi-room or ducted systems. NZ heat pump prices can vary a lot depending on brand, capacity, access, and whether extra electrical or building work is needed.
Common problems a poor installation can cause
Even a good brand can underperform if installed badly. Watch out for:
- noisy operation because the outdoor unit is too close to a bedroom or boundary
- poor heating because the unit is undersized or mounted in the wrong place
- water leaks from blocked or poorly sloped condensate drainage
- vibration from weak mounting or unsuitable brackets
- inefficient running because pipework is poorly insulated or too long
- ongoing faults caused by poor commissioning or electrical issues
These problems can be expensive to fix later, so the quality of installation matters as much as the product itself.
When a heat pump installer is not enough on their own
You may need other trades if your project involves:
- a new power circuit or switchboard upgrade
- structural wall work, new framing, or major support brackets
- roof or ceiling access for ducted systems
- drainage changes that affect plumbing work
- a new outdoor concrete pad or platform
- council consent for larger alterations or new building work
If you are unsure, ask the installer early whether the job will need coordination with other registered tradespeople or your local council.
Bottom line
A heat pump installer does much more than mount a box on the wall. Their job is to plan, fit, connect, test, and hand over a system that suits the home, the climate, and the way the household uses the space.
For New Zealand homeowners, the most important thing is to hire someone who knows the product and understands the legal boundaries between installation, electrical work, plumbing, and building work. Get multiple written quotes, check credentials, and make sure you know exactly who is responsible for each part of the job before work begins.
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