Warmer Kiwis Study: cost-benefit analysis of heat pumps

Mar 14, 2023

Warmer Kiwi Homes is an Energy Efficiency and Conservation Authority (EECA) programme aimed at making homes warmer, drier and healthier. EECA does this by offering grants to owner-occupying homeowners for home insulation and/or an efficient heater.


EECA commissioned Motu Research to investigate the impact of heat pumps installed under the Warmer Kiwi Homes programme. In response, Motu Research set up the Warmer Kiwis Study in 2021.


In this seminar we will report on results from our sample of around 160 homeowners who had received a Warmer Kiwi Homes grant for an energy-efficient heating device. These results relate to:

  • people’s health and wellbeing in their homes
  • the homes’ indoor environment (including temperature and humidity)
  • the outdoor environment from nearby weather stations
  • electricity consumption.

 Motu Research’s work concluded that using heat pumps in homes results in warmer and drier living areas through winter, and households save on electricity bills. Overall, the study’s findings show the Warmer Kiwi Homes programme is effective.

Seminar details

Register for the seminar here to attend in person at the City Gallery, Wellington

Register for the seminar here to attend ONLINE on Zoom.

Registrants will receive a recording after the event.

When: Monday 27 March 2023, 12pm – 1.30pm

Where: City Gallery Wellington, Te Whare Toi, Te Ngākau Civic Square, Wellington - and by videoconference on Zoom.

Click here to join the Zoom meetingMeeting ID: 878 9557 4558, Passcode: 0000



  • Gareth Gretton, Senior Advisor - Evidence, Insight and Innovation, EECA – to give an introduction
  • Arthur Grimes, Senior Fellow, Motu Research
  • Caroline Fyfe, Fellow, Motu Research
  • Shannon Minehan, Research Analyst, Motu Research
  • Phoebe Taptiklis, Fellow, Motu Research


Motu Public Policy Seminars are free to the public, but please subscribe to receive email notifications of Motu's events and publications.

Thanks to The Treasury, the Productivity Commission, Stats NZ and EECA for their generous support.


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