The Requirements
The NatHERS rating system has undergone significant changes from the 2019 building code to the 2022 building code. These changes reflect the Australian government's commitment to improving the energy efficiency of residential buildings and reducing greenhouse gas emissions.
One of the key changes in the 2022 building code is the increase in minimum energy efficiency requirements for new buildings. The code has raised the minimum NatHERS rating for residential buildings from 6 to 7 stars. This means that new buildings must achieve a higher level of energy efficiency than was required under the previous code. The code also includes new provisions for increasing the energy efficiency of existing buildings.
Another significant change in the 2022 building code is the introduction of a new heating and cooling load limit. This limit is intended to prevent the use of inefficient heating and cooling systems in new buildings. The limit sets a maximum amount of energy that can be used for heating and cooling, based on the building's size and climate zone. This is intended to encourage the use of more efficient heating and cooling systems and reduce energy consumption in new buildings.
The 2022 building code also includes new requirements for building envelope performance. This includes minimum levels of insulation, glazing performance, and air tightness. These requirements are intended to improve the thermal performance of buildings and reduce energy consumption.
Overall, the changes to the NatHERS rating system in the 2022 building code reflect the Australian government's commitment to reducing greenhouse gas emissions and improving the energy efficiency of residential buildings. These changes will have a significant impact on the construction industry and will require builders, architects, and homeowners to adopt new approaches to design and construction. However, they also represent an important step towards a more sustainable and energy-efficient built environment.