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

NatHERS Assessor Handbook

The NatHERS Handbook is being developed by the NatHERS Administrator in conjunction with industry experts. It is designed to help assessors navigate the NatHERS assessment process by describing how assessments should be conducted, including the mandatory and recommended steps of the process. The Handbook will present information to assist assessors, regardless of which assessment tool software is used.

The production of the NatHERS Handbook is well underway. Graphic design of about half the handbook is currently taking place and these chapters will soon be available for their first round of review.

The Handbook will be divided into chapters based on building and environmental elements, and assessment tool functions;

  • Chapter 1. Before you start
  • Chapter 2. Data entry
  • Chapter 3. Climate, terrain and exposure
  • Chapter 4. Zoning
  • Chapter 5. Floors
  • Chapter 6. Walls
  • Chapter 7. Windows and doors
  • Chapter 8. Ceilings and roofs
  • Chapter 9. Shading and eaves
  • Chapter 10. Finalising the assessment