This strikes me as a general problem in Australia, that we build everything for summer temperatures instead of winter temperatures.
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Australia renting: Rental properties are too cold in winter, research project finds https://www.smh.com.au/property/news/murray-measured-the-indoor-temperature-at-home-the-results-were-shocking-20230913-p5e4d0.html 

 @7dfc084c My goodness, yes. A 7° winter here in Brisbane sounds like bliss, until people realise that our houses are made of cardboard and it means 7° inside. Never been so cold!