If I could afford to, my house would be colder than 18 C or 64.5 F. I have my thermostat set at 68 and is still hot AF in my bedroom and living room.

Edit: I live in a place where the absolute lowest the temperature gets is 18-25 C, I used to live where the lowest it got was -51 C. Not everyone is acclimatized to that kind of cold, but I like it, especially when I’m sleeping.

Edit 2: my most controversial comment is expressing my opinion to a bunch of freezing Aussies that I prefer to be cold. Make sure you waste more of your effort downvoting me, and less effort figuring out how to use space heaters, put plastic up on the outside and inside of your windows, and hang up blankets to keep warmth in your critical areas. Y’all wouldn’t have survived a Minnesota winter. Just be grateful they didn’t sentence your ancestors to exile in Canada I guess 🤷‍♂️