NatHERS Climate Zones
NatHERS climate zones help make home energy ratings location specific. They recognise that a home in coastal NSW, inland Victoria, tropical Queensland or alpine Tasmania will not respond to heat, cold, humidity and solar exposure in the same way.
NatHERS climate zones are regions of Australia with similar climatic conditions. They help NatHERS software assess how much heating and cooling a home may need in its local climate. The same home design may achieve a different star rating in a different climate zone because the heating, cooling, humidity and solar conditions are different.
NatHERS is not designed to assess every Australian home as if it sits in the same weather conditions. A home in a hot humid climate has different performance pressures from a home in a cool temperate or alpine climate. Climate zones allow the rating to respond to that difference.
The thermal star rating estimates how much heating and cooling a home may need to remain comfortable. Local climate is therefore central to the result. Temperature patterns, humidity, solar radiation, wind and seasonal variation can all influence how the design performs.
This is why a design that performs well in one part of Australia may need changes somewhere else. The rating is not only about the house. It is about the relationship between the house and its climate.
NatHERS currently uses 69 local climate zones across Australia. These zones are more detailed than the broad climate descriptions many people use in everyday conversation, because NatHERS needs climate information that can support residential thermal modelling.
Climate zones are generally aligned with postcode boundaries for convenience. However, some postcode areas may have alternative zones where local topography or other features create meaningful climate differences. For example, a mountainous area within a postcode may require a different zone from lower lying areas nearby.
For assessment purposes, the relevant NatHERS accredited software and official NatHERS climate zone data should be used, rather than relying only on a general map or assumption.
A NatHERS climate zone is not just a label on a map. It affects the weather data used to model the home.
That means climate zone selection can influence heating loads, cooling loads and the final NatHERS star rating.
A NatHERS star rating is climate specific. The software assesses the proposed design using weather data for the relevant climate zone. This helps estimate how the home may perform through hot, cold and seasonal conditions across the year.
In a cooler climate, heat retention may be a major performance priority. In a hot climate, reducing unwanted heat gain may be more important. In a mixed climate, the design may need to balance winter warmth with summer cooling protection.
Because of this, the same construction system, window arrangement or shading strategy can lead to different outcomes depending on location. NatHERS climate zones help the assessment reflect those local conditions.
Climate can influence almost every thermal design decision. A design response that supports performance in one climate zone may be less suitable in another.
• Window size, orientation and glazing performance
• Eaves, awnings, balconies and external shading
• Ceiling, roof, wall and floor insulation
• Roof colour and external surface properties
• Thermal mass and construction materials
• Ventilation, air movement and cooling strategies
• The balance between winter solar access and summer solar protection
This is why there is no single NatHERS design formula for all Australian homes. Strong thermal performance comes from matching the building fabric to the site and climate.
In hot humid regions, design may need to focus heavily on shading, ventilation, solar control and reducing cooling loads. In hot dry regions, thermal mass, night cooling and solar protection may become more important. In cooler climates, insulation, draught control and winter solar access may have a stronger influence.
Temperate and mixed climates often require the most balanced response. A home may need to reduce heat gain in summer while still allowing useful winter sun and limiting heat loss in colder months.
NatHERS climate zones help account for these differences by applying climate specific data to the assessment. The result is a rating that is more meaningful than a one size fits all national assumption.
A high performing design in one climate is not automatically high performing everywhere.
The same glazing, insulation, shading and roof colour choices may need to change when the home is designed for a different NatHERS climate zone.
For new residential projects, the NatHERS climate zone is part of the assessment context used to calculate the thermal star rating. This can influence whether the design reaches the required performance level, including projects targeting or required to achieve a 7 Star Rating.
In NSW, climate specific thermal performance also connects with BASIX where NatHERS modelling supports the thermal pathway. For broader energy performance, Whole of Home may also need to be considered alongside the thermal rating.
The practical outcome is simple: the project location matters. A home’s energy pathway should be checked against the correct local climate data rather than copied from a similar looking design in another region.
Good climate responsive design starts early. Orientation, window placement, shading, insulation and material decisions are much easier to coordinate before the design is fully locked in.
For project teams working across different regions, it is important not to assume that the same specification will suit every site. A package that works well in one climate zone may need adjustment in another to achieve the same NatHERS outcome.
Understanding the climate zone early can help guide decisions about glazing, insulation, shading and thermal mass before they become expensive or difficult to change.
Certified Energy provides NatHERS assessments for new homes, townhouses and multi residential projects across Australia. Our team reviews the project location, documentation and design details to model the home against the relevant NatHERS climate data.
Where needed, we can help project teams understand how climate zone, glazing, insulation, shading, orientation and construction details are influencing the rating. We can also help connect the assessment with related requirements such as NatHERS, BASIX, 7 Star Rating and Whole of Home.
For a broader explanation of the rating framework, visit our NatHERS Knowledge Hub.
NatHERS climate zones are regions of Australia with similar climatic conditions. They help NatHERS software assess how a home design is expected to perform in its local climate.
How many NatHERS climate zones are there?NatHERS currently uses 69 local climate zones across Australia. These zones provide location specific climate data for thermal performance modelling.
Can the same home get a different NatHERS rating in another climate zone?Yes. The same design can perform differently in another location because heating needs, cooling needs, humidity, solar exposure and seasonal weather patterns may be different.
Are NatHERS climate zones the same as postcode areas?They are generally aligned with postcode boundaries for convenience, but some postcodes may have alternative climate zones where local topography or other conditions create meaningful climate differences.
Why should climate zone be checked early?Climate zone should be checked early because it can influence glazing, insulation, shading, thermal mass and the overall NatHERS pathway. Early review can reduce the risk of late design changes.