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Palmerston North, Manawatū-Whanganui

Heat pumps in Palmerston NorthSized for the frost, placed for the wind.

An installer for Palmerston North

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Palmerston North gets proper frosts: NIWA counts 10.1 air frosts and 41.4 ground frosts in an average year. That makes a heat pump's heating capacity at 2 degrees as important as its headline figure. Damp winter air and strong winds then shape where the outdoor unit should go.

Palmerston North's winters, read for a heat pump

A long frost season

NIWA records frosts almost entirely between April and October, with a lowest grass minimum of -7.3 degrees in July. On the 1991 to 2020 normals, via Wikipedia, July nights average a low of 4.7 degrees.

Lots of heating, little cooling

NIWA's degree-day table gives Palmerston North AWS 1,872 heating degree-days a year against 88 for cooling, and MBIE's H1/AS1 guidance places the city in climate zone 3. In the 2023 Census, 64.87% of city homes used a heat pump as a main heater.

Damp winter air

Mean 9 am humidity at the AWS is 80.9% across the year and 86.8% in June and July. EHINZ found 19.9% of people in the MidCentral health district lived in a damp home in 2023, just under the national 20.6%.

Wind

The AWS averages a 15.1 km/h wind, with gusts over 63 km/h on 50 days a year, and NIWA says Palmerston North has a higher share of stronger winds than the other Manawatū-Whanganui sites it compared.

Wood burners still common

In 2023, 41.4% of MidCentral homes used a wood burner as a main heater, against 28.2% nationally (EHINZ). Powerco's gas network also serves Manawatū.

Warm summer spells

February days average a high of 23.2 degrees, and the AWS averages 25 days a year above 25 degrees.

What frost means for your heat pump

Heat pumps lose output as it gets colder. Mitsubishi Electric NZ says it's extremely important units aren't undersized for low temperatures, and EECA says that where nights reach 2 degrees or less, a unit's heating capacity at 2 degrees should be at least its figure at 7. EECA adds that some units deliver more heat at 2 degrees than at 7, while others deliver less.

Defrosting is normal here. EECA says frosting starts to affect an outdoor unit below 5.5 degrees outside, and Mitsubishi Electric NZ says the more moisture in the air, the more freezes on the coil. On a damp, frosty morning, expect the unit to stop heating for a few minutes now and then while it clears the ice.

Placement matters for frost too. Mitsubishi Electric NZ says the outdoor unit's location is essential for low-temperature performance, and that units under houses, decks or anywhere airflow is impeded can create their own microclimate.

Other jobs Palmerston North homes ask for

Moving off the wood burner, or sharing the load with one. Warmer Kiwi Homes, EECA's programme, stopped accepting new wood burner applications on 9 January 2026, and EECA decides who's eligible for anything else. See the Warmer Kiwi Homes guide.

Whole-house heating for a long, frosty season, through a ducted heat pump or a multi-room heat pump.

Ventilation once the heating's sorted, for homes that stay damp: see home ventilation.

Summer cooling from the same unit: see air conditioning in Palmerston North. Further out? See Feilding.

Your part, and the installer's

You can

  • Compare the 2 and 7 degree heating figures on the Zoned Energy Rating Label.
  • Leave a defrost pause alone; the unit is doing its job.
  • Keep firewood and garden growth clear of the outdoor unit.
  • Clean the filters often through a long heating season.

Leave to a licensed installer

  • Sizing for the coldest mornings.
  • An outdoor spot with open air around it, away from bedrooms.
  • Refrigerant pipework and commissioning.
  • The electrical connection, the CoC and the ESC.

What we'd do

What we'd buy for a Palmerston North winter

We'd shortlist units whose heating capacity at 2 degrees is at least as high as at 7, and have the installer size for frosty mornings rather than mild afternoons. We'd put the outdoor unit somewhere open, not under the deck, and away from bedrooms. Then we'd give the house a winter before deciding whether the damp also needs a ventilation system.

Heat pump and heating jobs in Palmerston North

Areas around Palmerston North

Questions people ask

Why does my heat pump stop heating on frosty mornings?
Most likely it's defrosting. Consumer NZ says outdoor units sometimes freeze up and need a few minutes to defrost before carrying on. If it stops for long spells or shows an error, see heat pump not heating.
How do I pick a heat pump for Palmerston North frosts?
Look at the label's heating capacity at 2 degrees, not just 7. Consumer NZ also suggests people in near-zero areas check its database for a better low temperature performance score.
Heat pump or wood burner in Palmerston North?
BRANZ puts heat pumps in its best efficiency group and wood and pellet burners in its average group, and says all new woodburner installations need a building consent. Warmer Kiwi Homes no longer takes burner applications either.
Can you find an installer near me?
Tell us the job and your postcode. Registration-checked installers who specialise in that kind of work can see it. A job nobody local takes within 48 hours may then be shown to heat pump installers across Manawatū-Whanganui.

Ready for the right installer to take a look in Palmerston North?

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Read next

  1. 01Heat pumps in Manawatū-WhanganuiFrosty Palmerston North, damp Whanganui, burners, gas heaters and the rules across Manawatū-Whanganui.
  2. 02Air conditioning in Palmerston NorthGetting good summer cooling in Palmerston North from a heat pump chosen for frosty winters.
  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. 04Heat pump not heatingDefrost pauses, the wrong mode, dirty filters and the other reasons a heat pump blows cool air.
  5. 05Heat pumps compared with other heatingHow a heat pump stacks up against a wood burner, gas, electric heaters and central heating.
  6. 06Heat pump size calculatorRoom size and insulation in, a rough heating size in kW out, using BRANZ's rule of thumb.

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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