Came home to our place in Melbourne from two weeks away and the indoor temp was 2c.

Living in Perth now, it’s early evening and the house is already 19c inside. It’ll drop to 16c by midnight. Both houses are brick/tile.

Yes, I can run the reverse-cycle in a few rooms, and they’ll be toasty. Yes, I have heaters for other rooms. We use those when necessary, but they’re too expensive to run all winter.