Articles in this issue


Welcome to the sixth edition of the NatHERS Star.

Update on windows

The NatHERS Administrator is aware many assessors are frustrated with the current situation regarding windows and have been actively working on improvements to address these concerns.

Chenath updates for 2019

There are a number of updates planned for the Chenath engine, which improve accuracy of ratings and solve some long-lasting issues with the software.

WA climate zones and interactive climate zone map updates

The interactive climate zone map has been updated and can be accessed on the NatHERS website.

NatHERS Assessor Handbook

The production of the NatHERS Assessor Handbook is well underway.

Split heating and cooling loads for NCC 2019

The ABCB recently sought feedback on changes to the NCC 2019 that would set maximum heating and cooling load limits for the NatHERS pathway in the NCC.

Trajectory for Low Energy Homes and NCC 2022

In late 2018 the COAG Energy Council will consider a trajectory for low energy homes, including potential energy efficiency changes for the 2022 update of the NCC.


  • BDAV 10-Star Sustainable Design Challenge
  • Appliance Energy Rating Calculator
  • Your Home

WA climate zones and interactive climate zone map updates

The NatHERS interactive climate zone map is a useful visual representation of the 69 NatHERS climate zones and can be accessed online from the NatHERS website. Work was recently undertaken to update the map in order to ensure it aligns with NatHERS software tools. Unfortunately these updates took longer than expected and the interactive climate zone map was unavailable while the updates took place.

The improved NatHERS interactive climate zone map is now once again accessible online, however as noted in the NatHERS Technical Note v1.2 clause 4.5.4 ‘the NatHERS online Climate Zone map is for assessor reference only and the software selection of climate zone has preference.’ Please continue to use the climate zones as provided in the NatHERS software tools.

The interactive climate zone map can be accessed from the climate zone page of the NatHERS website.

At the same time as updating the interactive climate zone map, work was conducted to align the Western Australia (WA) postcode to climate zone information in NatHERS software tools with the Technical Requirements and climate zone variations outlined by the WA Government. NatHERS accredited software tools will be rolling out the WA changes shortly.