Early preview. We're still finishing this site, so some details shown are placeholders.
Find my installer

Regions

Heat pump installers in WaikatoOne region, two quite different winters.

Waikato homes need heating far more than cooling, and the job gets harder as you head south. NIWA's degree-day tables give Taupō 2,259 heating degree-days a year against 1,780 at Hamilton's Ruakura station, and Taupō's frosts are harder too. Size a heat pump for your own town's winter, not a Waikato average.

What changes across Waikato

Hamilton: frost and fog

NIWA's Ruakura station averages 62.9 ground frosts and 21.0 air frosts a year, mostly between May and September, plus 38 days of fog. MBIE's H1/AS1 energy efficiency rules put Hamilton City in climate zone 2.

Taupō: the colder end

Taupō NZED averages 35.2 air frosts a year, 10.6 of them in July, and its lowest grass minimum on NIWA's record is -10.2 degrees. H1/AS1 puts Taupō District in climate zone 4. It also logs 50 fog days a year, the most of NIWA's Waikato stations.

Geothermal ground north of Taupō

BRANZ ran an exposure site inside the Wairākei geothermal field. In its first year, mild steel and zinc corroded fast enough to sit in a higher corrosivity category than the NZS 3604:2011 exposure map shows for that spot.

Damp homes

EHINZ's 2023 Census figures put 20.8% of people in the Waikato health district in homes that were sometimes or always damp, close to the 20.6% national figure. The Lakes district, which takes in Taupō, sat higher at 23.9%.

Burners, smoke and gas

Wood burners were a main heater in 27.8% of Waikato health district homes in 2023. Taupō District Council said in 2024 that Waikato Regional Council monitoring points to improper wood burning as a leading cause of poor air late at night and early in the morning. Firstgas says its networks reach parts of Waikato, so check before you plan on mains gas.

What that means for a heat pump here

EECA says to check the heating capacity at 2 degrees wherever winter nights get that cold, and it should be at least the figure at 7. That's most of Waikato. In Taupō the gap matters more: Mitsubishi Electric NZ says a unit rated at 5.6 kW for heating will likely give about 4.76 kW at 0 degrees outside.

Fog is the other Waikato quirk. Mitsubishi Electric NZ says the more moisture there is in the air, the more freezes on the outdoor coil, and units wedged under decks can create their own microclimate. Near Wairākei, add corrosion protection to the list: BRANZ wants extra anti-corrosive coatings on outdoor units in geothermal areas.

Cooling is the small job. NIWA gives Ruakura 94 cooling degree-days a year and Taupō 54, so a unit bought for winter will cope with a hot February afternoon. Our size calculator is a sensible place to start.

Rules that apply in Waikato

None of these change at a district boundary. Connecting a heat pump is prescribed electrical work for a registered and licensed electrical worker, and they owe you a Certificate of Compliance no later than 20 days after the job.

Under Schedule 1 of the Building Act 2004, a hole of up to 300 millimetres through an existing house needs no building consent. The Building Code still applies, and so does your district plan, noise limits included. We don't hold verified noise limits for Hamilton City or Taupō District, so ask the council if your outdoor unit will sit near a boundary. In a unit title, read the body corporate rules before anyone drills.

Letting the house? The healthy homes standards require fixed heating that can bring the main living room to 18 degrees. If you own and live in it, Warmer Kiwi Homes is EECA's programme, and EECA decides eligibility. Our Warmer Kiwi Homes guide explains how it works.

When you're ready, tell us the job and your postcode. Local installers who specialise in that work can see it, and if it's still untaken after 48 hours, heat pump installers elsewhere in Waikato may see it too.

Cities in Waikato

Ready for the right installer to take a look?

Your postcode and three quick questions. Registration-checked local installers who specialise in your kind of job see it, and the one who takes it gets in touch to quote.

Free for you. Installers pay us for each job we pass on.

Read next

  1. 01Heat pumps in HamiltonSizing and placing a heat pump for Hamilton's frosty, foggy winters, and the jobs that come up most.
  2. 02Heat pumps in TaupōSizing and placing a heat pump for Taupō's frosts and fog, and the jobs that come up most.
  3. 03What size heat pump do I need?How to work out the kW for a room, and why the 2 degree figure on the label matters.
  4. 04Do you need a consent for a heat pump?When a heat pump needs a building consent, what applies without one, and the noise limits for outdoor units.
  5. 05The healthy homes heating standardWhat the rental heating standard asks for, which heaters count, and how to check a heat pump against it.
  6. 06Warmer Kiwi Homes heat pump grantsWho EECA's programme is for, what its current heat pump list covers, and how to check before you sign.

Where this information comes from

We don't publish prices. Every home is different, so an installer's written quote is the only real number. How we write and check these pages.

Find my installer