I think it is pretty well summarised on wers.net and on http://www.greenhouse.gov.au/yourhom...ical/fs18e.htm

<table class="tablepassive" summary="" cellpadding="0" cellspacing="0"><tbody><tr valign="top"><th>CITY</th> <th>CLIMATE CLASS</th> <th>HEATING FRACTION</th> </tr> <tr> <td>
Darwin
</td> <td>
Cooling
</td> <td>
0%
</td> </tr> <tr> <td>
Brisbane
</td> <td>
Cooling
</td> <td>
19%
</td> </tr> <tr> <td>
Perth
</td> <td>
Mixed
</td> <td>
31%
</td> </tr> <tr> <td>
Sydney (Airport)
</td> <td>
Mixed
</td> <td>
57%
</td> </tr> <tr> <td>
Adelaide
</td> <td>
Mixed
</td> <td>
68%
</td> </tr> <tr> <td>
Melbourne
</td> <td>
Heating
</td> <td>
80%
</td> </tr> <tr> <td>
Canberra
</td> <td>
Heating
</td> <td>
88%
</td> </tr> <tr> <td>
Hobart
</td> <td>
Heating
</td> <td>
98%
</td></tr></tbody></table>
In a MIXED CLIMATE (temperate) the best results are obtained from windows that insulate well (low U-value), admit plenty of free solar energy (high solar heat gain coefficient) on the north during cooler months, but limit solar heat gain from the east and west (low solar heat gain coefficient). Ideally, northerly windows should be protected by correctly sized eaves. This will provide protection from summertime heat and glare while still allowing sun penetration in winter.

In a cooling climate (tropical, subtropical or hot arid) the best results are obtained from windows that limit solar heat gain on all orientations (low solar heat gain coefficient). Although the first two climates are frequently humid while the last one is not, they can all subject the home to the risk of overheating at any time of the year. Good insulation (a low U-value) is also beneficial, especially if the home is air-conditioned.

In a heating climate (alpine and cool temperate) the best results are obtained from windows that insulate well (low U-value) and admit plenty of free solar energy (high solar heat gain coefficient). In a cold region, large west-facing windows may contribute to short-term overheating in summer, but glazing with a low solar heat gain coefficient must be used with caution on the west because of the energy penalty it causes over the rest of the year.