Typically speaking, Passive Houses in Melbourne do require active heating and cooling systems. However, systems can be as simple and as economical as one or two split systems, in opposed to a more expensive ducted heating/cooling system and or a hydronic heating system.
There have been some houses built in Australia using the Passive House principles, with a climate similar to Melbourne, where they have installed wood fires to find they have only used them a few times. This illustrates the effectiveness of Passive House.
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