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Regions

Heat pumps in TaranakiMild and damp by the sea, much colder inland.

Where you are in Taranaki changes the heat pump you need. NIWA gives New Plymouth 1,640 heating degree-days a year and inland Stratford 2,309, so the same room inland needs a lot more heating over a winter. Along the coast, the bigger issues are damp air, strong gusts and salt from the surf.

The Taranaki difference

Coast or inland

NIWA's degree-day table (base 18 degrees) gives New Plymouth AWS 1,640 heating degree-days and just 67 cooling degree-days a year, while inland Stratford Dem Farm logs 2,309 heating degree-days. MBIE's H1/AS1 guidance puts New Plymouth District in climate zone 2, and in the 2023 Census 53.15% of the district's homes used a heat pump as a main heater.

Frost is rare on the coast

New Plymouth averages about 1.5 days a year below 0 degrees, and its automatic weather station records about 1.3 air frosts and 8.5 ground frosts. On NIWA's 1991 to 2020 normals, via Wikipedia, its July nights average a low of 5.9 degrees.

Damp air, damper inland

NIWA puts mean 9 am relative humidity at New Plymouth Aero at 83.0%, peaking at 86.1% in June, and says inland sites such as Normanby and Stratford tend to be more humid. EHINZ found 20.7% of people in the Taranaki health district lived in a damp home in 2023, against 20.6% nationally.

Wind and surf salt

New Plymouth Aero records gusts over 63 km/h on 83 days in an average year. Homes within 500 m of the coast sit in NZS 3604 exposure zone D for sea-spray salt, and BRANZ notes E2/AS1 adds a zone E for breaking surf beach fronts, where buildings need washing more often.

Gas

Powerco's gas network serves Taranaki. Putting in a flued gas heater is gasfitting work for a registered gasfitter.

How the national rules play out in Taranaki

Whoever wires in your heat pump must be a registered and licensed electrical worker, because the connection is prescribed electrical work. Ask for the Certificate of Compliance within 20 days of the work, and keep the Electrical Safety Certificate somewhere safe for 7 years or more.

Schedule 1 of the Building Act 2004 means a pipe hole of up to 300 millimetres through an existing house needs no consent. Exempt work must still meet the Building Code and the district plan, and noise limits for outdoor units sit in the district plan. We don't have the local limits to quote, so ask the council before you settle on a spot close to a boundary.

Rentals have had to meet the healthy homes standards since 1 July 2025. If you own the home you live in, Warmer Kiwi Homes is EECA's programme, and EECA says it makes no exceptions to its eligibility criteria.

What you can do first

You can

  • Tell the installer if you live inland, and how cold your mornings get.
  • Wipe the window condensation in June and note the worst rooms.
  • Near the surf, wash the outdoor unit as your manual allows; Mitsubishi Electric NZ suggests every 6 months.

Leave to a licensed installer

  • Sizing for an inland winter.
  • Corrosion protection and a bracket for a windy, salty site.
  • The electrical connection and its paperwork.

What we'd do

Our take for Taranaki

By the sea, frost is the least of it. We'd put the effort into salt, wind and damp: a corrosion-protected outdoor unit, fixed solidly, plus kitchen and bathroom fans that vent outside. Inland, we'd make sure the installer sizes for Stratford's much bigger heating need rather than New Plymouth's. And if no local installer takes your job within 48 hours, heat pump installers elsewhere in Taranaki may see it too.

Cities in Taranaki

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Read next

  1. 01Heat pumps in New PlymouthMild winters, damp air, surf salt and wind: what to get right on a heat pump in New Plymouth.
  2. 02Heat pump installationWhich heat pump suits the room, how to size it, and what a good install and quote include.
  3. 03Home ventilation systemsWhat a home ventilation system does, the two main types, and how to tell which one suits your house.
  4. 04Heat pump servicingHow often to service a heat pump, what a good service checks, and why the warranty cares.
  5. 05What 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.
  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.

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