Optimum design details - variations across the temperate (warm summer, cool winter) zone

Even though Sydney, Melbourne and Adelaide are all in the temperate climate zone, optimum design details can be fine-tuned to allow for climate differences between the three cities.

• In Melbourne, where there is not a lot of winter sun, north-facing glazing should be from 25 to 40% of the floor area. Windows in Sydney should be from 20 to 30% of floor area. The higher glazing values are for houses of heavier construction.
• Evaporative cooling works well in Melbourne and Adelaide, but not in Sydney, because of the greater summer humidity there.
• More ceiling insulation is needed in Melbourne than in Adelaide, and Adelaide needs more than Sydney. If refrigerative air-conditioning is to be used, then even thicker ceiling insulation is recommended. In the cooler parts of the temperate zone (including Melbourne) it is worthwhile insulating timber floors.

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