WERS Glazing Heat Gain Double Glazed Unit Heat Loss Orientation
Helpful Resources | Energy Rating Zones
Australian Building Codes Board
Map source: Australian Building Codes Board: www.abcb.gov.au

Zone 1, 2 & 3

Hot, humid summers and relatively mild - requires more energy to keep heat entering the building.


This means you require a cooling system for a hot climate.




Zone 4 & 5

Mixed climate both warm to hot summers as well as cool to cold winters require a balance of heating or cooling throughout the year.


This means that the load is similar for winter and summer you need a system that will suit both climates.


Zone 6, 7 & 8

Cold areas that need heating to prevent heat loss and allow heat gain from the sun.


This means you require a a heating system for a cold climate.




Glazing is the highest element of energy heat gain and heat loss in a buildng. The Australian energy code in relation to glass is performance based on the building envelope. In other words, in summer for very hot climates reducing the heat gain and winter for very cold climates reducing the heat loss through the building, and mixed climates using both heat gain and heat loss properties.


Energy performance of glazing is based on the Australian Fenestration Rating Council (AFRC) guidelines and these are measured in terms of u-Value (uV) and solar heat gain co-efficient (SHGC). The Glazing calcuation system can be measured either by glass performance data (glass only) or by the window system (combination of glass and frame).


Under the code deem to satisfy provisions are made up of a mixture of glazing sizes, glass and frame type, eg a sliding window that is 1800mm(h) x 800mm (w) with a double glazed unit glazing option in an aluminium frame.



Individual Australian State Maps showing specific area zones


New South Wales






South Australia







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