Heat pump installation in Rotorua
Your installer will size it for a morning below zero rather than an average one, and specify an outdoor unit the sulphur in the air won't corrode, so it's warm through the worst of the winter and still working in ten years.
What it costs
The prices below are supplied and fitted, so they cover the unit, the brackets, the pipework, the drain, the electrical connection and the commissioning. The gap between one quote and another comes down to how far the pipework has to go, how exposed the outdoor position is, and whether the switchboard needs a new circuit.
| Type | Supplied & fitted | Suits |
|---|---|---|
| High-wall bedroom or small room | $2,500 to $3,500 | Around 2.5kW, and the cheapest way to get one room warm. |
| High-wall main living area | $3,200 to $4,800 | A 5 to 6kW unit, which is where most Rotorua lounges end up. |
| High-wall large or open-plan | $4,500 to $6,500 | A 7 to 8kW unit for a knocked-through living, dining and kitchen. |
| Multi-split two rooms or more | Quoted per head | Several indoor heads off one outdoor unit. The price follows how many and how far apart they are, so it gets worked out on site. |
| Ducted whole home | $12,000 to $25,000+ | Hidden above the ceiling with only the grilles showing. Needs the roof space for it. |
You'll get a firm price once your installer has the right measurements and details of your job. Costs can vary a lot, and the cost page goes into why.
What’s included in the price
Supply and install is handled as one job, so there's no chasing a separate supplier and sparky.
- The heat pump, sized to your room
- An outdoor unit with a finish that suits how exposed your site is
- Wall brackets and a level base for the outdoor unit
- Insulated pipework and the condensate drain
- Electrical connection and certification
- Commissioning and a walk through the controls
- A tidy-up before they leave
- Manufacturer warranty on the unit
How a heat pump installation works
A single high-wall is half a day to a day, once everyone is on site.
Free quote
Send your suburb, the rooms you want warm, and roughly how old the house is. That's enough to come back with options and a price.
Site visit
Your installer walks the room, finds where the outdoor unit can sit clear of the low ground, and works out how exposed the spot is before anything is ordered.
The install
The indoor head goes up, the outdoor unit is set level on brackets or a stand, and the pipework, drain and wiring go in. The lines are vacuumed and pressure tested before the system is charged, because a leak found later is a lot dearer than one found now.
Commissioning
You're shown how to run it, including the dry mode, which does more work in a Rotorua winter than most people expect.
Which type of heat pump suits your home
Rotorua housing runs from lakeside flats to the hill suburbs, and a draughty weatherboard bungalow with high ceilings wants a different answer from a sealed new build on the same street.
High-wall
Mounted up high and blows warm air down across the room. The everyday choice, and the cheapest to buy and to fit.
Floor console
Sits at skirting height and pushes warmth out at floor level, so you feel it before it reaches the ceiling. That matters in an old bungalow with a high stud, where a high-wall sends a lot of its heat straight up.
Ceiling cassette
Sits flush in the ceiling and throws air four ways, so an open-plan room warms evenly instead of from one end. Needs the cavity depth above the gib.
Multi-split
Several indoor heads off one outdoor unit, which keeps one box on the wall instead of three and gives you one outdoor position to get right rather than three.
Ducted
Vents in the ceiling and nothing on the walls, heating every room off one system. The dearest, and the easiest by far to fit while a house is being built.
What size heat pump do you need
Floor area alone won't tell you the right unit here, because it's the frosty mornings that decide it rather than the average ones.
Bedroom or small room
About 2.5kW.
Living area
5 to 6kW.
Large or open-plan
7 to 8kW.
Those suit a room in reasonable shape. Single glazing, a high stud or a draughty older bungalow and you go up a size.
Why the cold mornings change the sums
A heat pump warms your house by pulling heat out of the air outside and moving it in. The colder that air gets, the less heat there is in it to move, so the unit's output drops away on exactly the mornings you want it most. Rotorua goes below freezing more often than most of the country, so a unit chosen off its mild-day figure can be well short in July.
And why the damp changes them again
The air here is humid as well as cold, and a heat pump is drying the room at the same time as heating it. A unit with capacity to spare gets the room up to temperature quickly, shuts down before it has pulled much moisture out, and leaves you warm and still clammy. An undersized one runs flat out and never gets there at all.
The older single-glazed bungalows through the western suburbs lose heat through the walls and windows faster than they can be refilled, so they need real capacity to hold a temperature through the evening. A newer insulated place of the same floor area holds it on considerably less.
The sizing calculator gets you a starting figure, and your installer measures the room rather than guessing.
Replacing an old heat pump
When a Rotorua heat pump gives up, it is usually the outdoor half that has gone rather than anything indoors.
Ten years or more, struggling, or throwing error codes usually means replacing beats repairing, because parts get scarce and efficiency has moved a long way since.
The brackets, pipework and wiring can sometimes stay if they are the right size and in good condition, which takes a chunk off the price. Pipework contaminated with the old refrigerant gets replaced instead, because leaving it in shortens the life of the new system.
It's also the moment to move the outdoor unit if the last one ended up in a frost hollow or somewhere nobody could reach it. Both are cheap to fix while the job is open and expensive to fix afterwards.
Worth knowing up front: ask what finish the outdoor unit has. The back of it is packed with thin aluminium fins, and sulphur corrodes them, so on an exposed site a treated blue-fin or gold-fin one is the difference between a unit that lasts its warranty and one that doesn't. It is a small line on the quote next to replacing the outdoor unit years early.
Consent and electrical work
A standard high-wall heat pump doesn't need building consent, because it isn't structural work. A ducted system going into a new build or a major renovation can be part of a consent that already exists for the building work.
The electrical work is done and certified by a registered electrician, and the refrigerant work by someone holding an approved filler licence. Both are legal requirements rather than preferences, which is why this isn't a DIY job.
Two things worth raising before work starts: body corporate or cross-lease rules if you share a title, and a neighbour close to the boundary, since the outdoor unit makes a low hum and the position is easy to move on paper and awkward to move afterwards.
Looking after your heat pump
Rotorua air is hard on the outside half of the system in a way it is not in most of the country. Sulphur settles on the aluminium fins and corrodes them, and a coil that gets rinsed down once a year keeps far more of its metal than one left to it.
The inside half is yours and it takes two minutes. Pop the front open, slide the filters out and rinse them under the tap every few weeks through winter. A blocked filter starves the unit of air, so it runs longer for less warmth and costs you more doing it.
Some things are not a cleaning job. Icing up, tripping the breaker, dripping inside, blowing lukewarm or a new rattle all mean something needs looking at, and the annual service is where the coil gets washed and the charge gets checked.
Common questions about heat pump installation
How much does heat pump installation cost in Rotorua?
Supplied and fitted, about $2,500 to $3,500 for a bedroom or small room, $3,200 to $4,800 for a main living area, and $4,500 to $6,500 for a large or open-plan space. Whole-home ducted starts around $12,000. How far the pipework has to go, how exposed the outdoor position is, and whether the switchboard needs a new circuit are what move the price within those figures.
How long does it take to install a heat pump?
A single high-wall is half a day to a day, so you're warm the same day. A long stretch of pipework, an awkward wall or more than one unit can stretch it to two days, and multi-split and ducted systems are planned in advance over a longer period.
Do I need a special heat pump for Rotorua air?
On an exposed site, yes. Sulphur and geothermal moisture corrode the aluminium fins on the outdoor coil, and once they crumble the unit has less metal to shed heat through and costs more to run. A treated blue-fin or gold-fin coil costs a little more and lasts considerably longer. Exposure changes street by street, so it gets checked on site rather than assumed.
Where should the outdoor unit go?
Somewhere with air around it, up off the ground on brackets or a stand rather than sitting in a low spot where the cold air pools overnight, and with a drain path for the meltwater. Somewhere a technician can actually stand matters too, or the annual service turns into a bigger job than it needs to be.
Can I install a heat pump myself?
No. Handling refrigerant requires an approved filler licence in New Zealand, and the hard-wiring has to be done and certified by a registered electrician. A DIY install also voids the manufacturer's warranty. You can do the prep, like clearing the wall and sorting access, but the install itself is a licensed job.
Do I need consent to install a heat pump?
Not for a standard high-wall unit. The electrical work is certified as part of the install. If you're in a body corporate or cross-lease with rules about outdoor units, check those before booking. Rotorua Lakes Council is the authority on anything to do with consent.
Will a heat pump help with the damp?
Yes, if it is sized right and run steadily. Held on a modest setting through the evening it works on the moisture continuously and keeps wall and window surfaces above the point where condensation forms, which is what stops the mould rather than the raw temperature. Blasting it and switching it off does the heating without the drying.
What does a heat pump cost to run?
A correctly sized unit heating a living room through a Rotorua winter typically adds somewhere between $25 and $60 a month to the power bill, depending on the hours you run it and how leaky the house is. Heat pumps deliver roughly three to four units of heat per unit of electricity, which is why they cost less to run than any plug-in heater.
Get a price for your place
Tell us the room, the age of the house and your suburb, and your local installer will size it properly and quote you a fixed price.