Typical heat pump installation timeframes
For most New Zealand homes, a standard heat pump installation takes 4 to 8 hours once the installer is on site. In straightforward cases, it may be finished in half a day. If the job is more complex — for example, a multi-room system, difficult access, or extra electrical work — it can take one to two days, sometimes longer if follow-up work is needed.
What many homeowners do not see is that the on-site install is only part of the job. There is usually also:
- a site visit or remote assessment
- product selection and quoting
- ordering the unit
- booking the installer and electrician
- any consent or compliance steps
In a busy summer period, the whole process from quote to completion can take a few days to several weeks, even if the install itself is relatively quick.
Common jobs and how long they usually take
The table below gives a practical guide to typical timeframes. These are general estimates only — the final duration depends on access, the condition of the house, and whether the installer needs to coordinate with other trades.
| Job type | Typical on-site time | Notes |
|---|---|---|
| Standard high-wall single split system | 4–8 hours | Common for bedrooms, lounges, and small homes |
| Mid-sized split system with longer pipe run | 6–10 hours | Extra time if pipework needs to be routed through roof space or underfloor |
| Multi-split system | 1–2 days | More indoor units and more refrigerant pipework usually means a longer install |
| Ducted heat pump | 1–3 days | Often requires ceiling or roof-space work, more labour, and careful placement of grilles |
| Replacement of an existing unit like-for-like | 3–6 hours | Faster if the old unit can be removed easily and wiring is already suitable |
| Install in a difficult-to-access property | 1–2 days or more | Steep sections, multi-storey homes, or tight roof spaces can slow things down |
| Install with significant electrical upgrades | Varies | May require a registered electrician and extra time for switchboard or circuit work |
Standard replacement versus new installation
A like-for-like replacement is usually the fastest type of job. If the old heat pump is being swapped for a similar unit and the pipework, drainage, and electrical supply are already in good condition, the installer may complete it in a morning.
A new installation usually takes longer because the team may need to:
- decide the best indoor and outdoor locations
- drill through the wall for pipework
- install or extend drainage
- mount the outdoor unit on brackets, pads, or a frame
- confirm the electrical connection is suitable
- test performance and explain operation to you
What happens during the install
Understanding the process helps you plan the day more accurately. A typical heat pump installation may include:
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Site check and final positioning The installer confirms the exact location for the indoor and outdoor units, taking into account airflow, noise, access, and manufacturer requirements.
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Mounting the indoor unit The wall bracket is fixed in place and the unit is mounted securely.
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Installing the outdoor unit This may be placed on a ground pad, wall brackets, or another suitable base.
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Running pipework and drainage Refrigerant pipes, condensate drainage, and cabling are routed between the units.
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Electrical connection In New Zealand, electrical work must be carried out by a suitably authorised person. A heat pump often needs a dedicated circuit or other electrical work, depending on the model and existing setup.
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Vacuuming, testing, and commissioning The system is pressure-tested and checked for leaks, then started up and tested.
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Demonstration and clean-up The installer should show you how to use the controller, change filters, and set efficient temperatures.
What causes delays
Some jobs run smoothly, but delays are common when the installer finds issues that were not obvious at quoting stage. The most common causes include:
Access problems
Heat pump installers often work in roof spaces, on ladders, or around tight outdoor areas. Delays happen when:
- the roof space is too cramped or unsafe to work in comfortably
- the outdoor unit location is awkward to reach
- scaffolding or extra access equipment is needed
- the section is steep, wet, or slippery
In winter or during heavy rain, outside access can slow the job further.
Electrical upgrades
Many homes already have suitable wiring, but not all do. A registered electrician may need to upgrade the circuit, replace a switchboard component, or re-route cabling. If the existing installation does not meet current requirements, the heat pump may need to wait until the electrical work is finished.
Older homes and hidden issues
Older NZ homes can bring surprises such as:
- brittle wall linings
- timber framing that is harder to fix to than expected
- limited roof-space access
- existing pipework that is not reusable
- damaged cladding or moisture issues around the planned drilling point
If the installer finds rot, leaks, or unsafe wiring, they should stop and advise you rather than work over the problem.
Consent or compliance questions
Most routine heat pump installs do not require a building consent, but some situations may trigger extra requirements. For example, a more involved installation may involve structural work, significant penetrations, or a location that needs council input. If the work affects the building structure or weather-tightness in a material way, check with your local council before starting.
Electrical work is regulated by the EWRB, and plumbing/gasfitting/drainlaying are restricted work under the PGDB. If your job includes associated work outside the installer’s scope, make sure the right licensed people are involved and that you receive the correct compliance documents.
Peak-season demand
In New Zealand, heat pump installation demand often rises in:
- late autumn, as people prepare for winter
- early winter, when the weather turns colder
- summer, when some households book cooling upgrades
At these times, the actual install may still take a day, but the wait for a quote, unit delivery, or booking slot can stretch out. If you want the work done before a cold snap, organise it early.
How to plan your home around the work
Good planning can save hassle on the day and help the installer finish faster.
Before the installer arrives
- Clear furniture away from the indoor unit location.
- Make sure both the indoor and outdoor areas are accessible.
- Move cars, pets, and children away from the work zone.
- Check there is safe access to the switchboard if electrical work is needed.
- Confirm where you want the remote controller mounted.
- Ask whether the installer needs the attic hatch, subfloor access, or a ladder gap.
If the job is in a rental or multi-unit property, let neighbours, property managers, or tenants know in advance.
On the day
It is sensible to expect some noise, drilling dust, and short periods without power to the relevant circuit. If the installer needs to test the unit after electrical work, they may also need to isolate power for part of the day.
You may want to plan around the job by:
- working from home only if you can tolerate noise
- avoiding video meetings during the drilling and mounting phase
- keeping the room clear for a few hours after installation so the installer can test and tidy up
After installation
Ask the installer how long you should wait before heavy use, and check the handover documents carefully. Keep:
- the invoice
- warranty information
- compliance paperwork, if supplied
- maintenance instructions
This is particularly important if the installer has also arranged electrical work or other regulated work.
How to compare quotes properly
The cheapest quote is not always the fastest or best value. When comparing heat pump installers in NZ, ask each one for a written quote that spells out:
- the exact unit model and capacity
- whether installation, brackets, pads, drainage, and consumables are included
- who is doing the electrical work
- whether any scaffold, access gear, or extra labour is extra
- expected start and finish times
- warranty terms
- what happens if hidden issues are found
It is also sensible to check:
- the installer’s experience with your type of home
- whether they use licensed electricians where required
- whether they can provide compliance documentation if the job calls for it
- recent reviews from NZ customers
If your home is older, on a steep section, or has a complicated layout, ask for an on-site assessment rather than relying on a quick phone quote.
Weather, season, and region matter in New Zealand
NZ conditions can affect both scheduling and install speed.
- Winter: Wet weather, cold roof spaces, and higher demand can slow booking times and on-site work.
- Summer: Some installers are busy with cooling-focused jobs, especially in warmer regions.
- High-wind or exposed coastal sites: Outdoor unit placement may need extra care to manage salt air, vibration, or wind loading.
- Regional differences: In some smaller towns and rural areas, you may wait longer for the right installer or for parts to arrive.
If your home is in a flood-prone area, on a steep hillside, or exposed to salt spray, discuss the outdoor unit location early so the installer can allow enough time and materials.
Signs the job may take longer than expected
You should plan for extra time if any of these apply:
- you want more than one indoor unit
- the house is two-storey or has limited access
- the switchboard is old or crowded
- the planned outdoor site is a long way from the indoor unit
- the installer has not seen the property before
- the wall where the unit is going is weatherboard, brick veneer, or otherwise harder to drill through
- there is no existing drain path for condensate
- you are replacing an old system that was installed poorly the first time
A realistic rule of thumb
For a straightforward home in good condition, assume:
- Half a day for a simple replacement
- Most of a day for a standard single split system
- One to two days for a ducted or multi-split system
- Extra time if electrical upgrades, difficult access, or compliance issues are involved
If you are scheduling around a cold front, visitors, a work-from-home week, or a rental inspection, build in a buffer rather than assuming the shortest possible timeframe.
Bottom line
Most heat pump installation work in New Zealand is completed in one day or less for a standard job, but the real answer depends on the size of the system, the condition of your home, and whether extra trades are needed. The best way to avoid delays is to get a proper site assessment, compare written quotes, and check that the right licensed people are handling any regulated work.
Plan early, ask clear questions, and allow some flexibility in the schedule — especially during the busy winter period.
ISO 9001
