Heat pump installation in Hamilton
Your installer will size it for the mornings that actually test it rather than an average winter day, so the house is warm when the frost holds past sunrise instead of the unit running flat out and still falling short.
What it costs
Prices below are supplied and fitted, so they take in the unit, the brackets, the pipework, the electrical connection and the commissioning at the end. A cheaper number online is the box on its own, and the fitting still has to be paid for.
| Type | Supplied & fitted | Suits |
|---|---|---|
| High-wall bedroom or small room | $2,200 to $3,000 | Around 2.5kW, and the cheapest way in. |
| High-wall main living area | $3,000 to $4,500 | A 5 to 6kW unit, which is where most Hamilton lounges land. |
| High-wall large or open-plan | $4,200 to $6,000 | A 7 to 8kW unit for a knocked-through living, dining and kitchen space. |
| Multi-split 2 to 3 rooms | $6,000 to $10,500 | Several rooms off one outdoor unit, so you keep one box on the wall instead of three. |
| Multi-split 4 or more rooms | $9,500 to $14,000 | Enough heads to cover most of a larger home. |
| Ducted whole home | $12,000 to $25,000+ | Hidden in the ceiling with only the grilles showing. Needs the ceiling 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
- Wall brackets and a level base for the outdoor unit
- Insulated pipework and the condensate drain
- Electrical connection and certification
- Commissioning and a run-through of the controls
- A tidy-up before they leave
- Manufacturer warranty on the unit
- Removal of the old unit, if you're replacing one
How a heat pump installation works
A single high-wall is usually a day or less, once everyone is on site.
Free quote
Send your suburb, the rooms you want warm, and whether the house is single or double glazed. That's enough for options and a price.
Site visit
Your installer looks at the room, checks where the outdoor unit can sit, and works out the size before anything gets quoted.
The install
The indoor head goes up, the outdoor unit is set level, and the pipework, drain and wiring all go in. Then it's tested before anyone leaves.
Commissioning
You're shown how to run it, including the dry mode, which does a lot of the work in a Waikato winter.
Which type of heat pump suits your home
Waikato housing is a real mix, and a single-glazed villa in Hamilton East wants something different from a sealed new build in Rototuna. The other types of heat pump are compared side by side if you're weighing them up.
High-wall
Mounted up high and blows warm air down across the room. The everyday choice, and it suits a well-sealed modern home best.
Floor console
Sits low and pushes warmth up from the floor, which is where you feel it first in a draughty villa on a foggy morning.
Ceiling cassette
Recesses into the ceiling and spreads air four ways, for open-plan rooms or where you want nothing on the wall.
Multi-split
One outdoor unit running three or four indoor heads, so the whole house gets sorted without a row of outdoor boxes down the side of it.
Ducted
Hides in the ceiling and feeds every room evenly. It suits the newer builds around Rototuna and Cambridge that have the ceiling space for it.
What size heat pump do you need
Floor area alone won't tell you the right unit here, because the cold mornings are the ones that decide it.
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, high ceilings or a draughty older villa and you go up a size.
Why the fog changes the sums
A heat pump works by pulling heat out of the air outside. On a clear frosty Waikato morning there's less of it to pull, and the damp air means the outdoor coil frosts up and has to stop and defrost itself now and then. While it's doing that it isn't heating your room.
So the unit gets sized for the coldest mornings rather than the average ones. Size it off the average and it'll be running flat out on a frosty July morning and still not getting the room warm.
An old villa needs more than a new build
The timber villas and 1950s to 70s bungalows through Hamilton East and the central suburbs are lightly insulated, with high ceilings and plenty of gaps, so the same-sized room needs a bigger unit than it would in a sealed new build out at Rototuna, Flagstaff or Cambridge.
Both mistakes cost you. Buy too small and it runs flat out on a frosty morning and still never gets there. Buy too big and it races the room up, shuts off, starts again a few minutes later, and never settles into the steady run that actually dries the place out.
The sizing calculator gets you a starting figure, and your installer measures the room rather than guessing.
Replacing an old heat pump
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. If yours is icing up, tripping the breaker, dripping inside or blowing lukewarm, that's worth looking at before it packs in through the coldest fortnight of the year.
The pipework and cabling can sometimes be reused if they're the right size and in good condition, which takes a chunk off the price, and that gets checked rather than assumed. Pipework contaminated with the old refrigerant gets replaced instead, because leaving it shortens the life of the new system. Taking the old unit away is part of the job.
It's also the moment to move the outdoor unit if it ended up somewhere awkward. A long stretch of pipework round a two-storey villa was often the easy option at the time, and a replacement is the chance to shorten it.
Worth knowing up front: your installer services and repairs the systems they install, not other companies' work. If someone else fitted yours they'll still come out, look at it and quote a replacement.
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 is usually covered by the consent for that job rather than needing its own, and Hamilton City Council is the authority if anything about your situation is unusual.
The electrical work is done and certified by a registered electrician, and the refrigerant work by someone holding an approved filler licence, which is a legal requirement in New Zealand. Both are part of the install and you get the paperwork.
Two things worth raising before work starts: a character or heritage listing on an older home, and body corporate or cross-lease rules if you're in a unit or a townhouse. Either can decide where the outdoor unit is allowed to go, and your installer will flag it at quote stage rather than on the day.
Looking after your heat pump
Hamilton's fog and humidity fill a filter faster than a drier part of the country. Damp, dust and mould build up inside the unit, and a clogged filter means weak airflow, a bigger power bill and that musty smell blowing round the house. Get it serviced once a year, ideally before winter.
You can do the easy part yourself. Pop the front open, slide the filters out and rinse them under the tap every few weeks through winter. In an older timber home they clog faster, because the unit is doing a lot of the drying as well as the heating, and on a multi-head system there's a filter behind every indoor unit rather than just the one.
Some things aren't a cleaning job. Icing up, tripping the breaker, dripping inside, blowing lukewarm or a new rattle all mean something needs fixing, and catching it early is cheaper than nursing it through winter. Book a service or see what's involved.
Common questions about heat pump installation
How much does heat pump installation cost in Hamilton?
Supplied and fitted, a high-wall runs about $2,200 to $3,000 for a bedroom, $3,000 to $4,500 for a main living area and $4,200 to $6,000 for a large or open-plan space. Multi-split systems are $6,000 to $14,000 depending on how many rooms, and whole-home ducted starts around $12,000.
What pushes the price up?
The pipework between the indoor and outdoor units, mostly. A straightforward high-wall in an easy spot is a lot less than a long stretch of pipework round a two-storey villa. A switchboard upgrade adds cost if the board can't take another circuit, and an older single-glazed home often needs more capacity than a modern one, which is a bigger unit.
How long does it take?
Most single high-wall installs are a day or less once everyone's on site. Longer pipework, awkward access or a two-storey villa push it out, and ducted systems take two to three days depending on the ceiling access. You get a realistic timeframe with the quote.
What size do I need for an older villa?
More than the floor area alone suggests. Single glazing, high ceilings and gaps in an older timber home all mean the room needs a bigger unit than the same space in a sealed new build. It gets measured on site rather than guessed.
Where should the heat pump go?
The indoor head goes high on a wall in the room you actually sit in of an evening, with a clear path for the warm air down the length of the room. Not blowing at the couch or into a corner. The outdoor unit needs air around it, a level base and a short way back to the indoor head.
Will it help with the damp, or just the cold?
Both, and in a foggy valley-floor winter the damp is half of it. A correctly sized unit held on a low steady output dries the room as it warms it. One that's too big keeps stopping and starting and never runs long enough to pull the moisture out.
Do I need consent?
Not for a standard high-wall unit, since it isn't structural work. The electrical work is certified as part of the install and the refrigerant work has to be done by someone licensed for it. Heritage listings and body corporate rules are the two things worth checking before booking.
What does it cost to run?
A correctly sized unit heating a living room through a Waikato winter typically adds somewhere between $25 and $60 a month to the power bill, depending on the hours you run it and how well the house holds heat. Heat pumps return 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 whether it's single or double glazed, and your local installer will come back with a fixed price.