Hotter inside than outside must be a nightmare especially to sleep.
I manage to keep temperature around 23/24 during summer and exceptionality 26/27 during heat wave. But I don't have AC.
It's a bit more difficult on winter when the max temperature of the day is 1-2 degrees and there is no sun. Radiators need work frequently to keep 18 degrees.
I wish we would have more sunny winter days.
It's a house from the early 70s in France.
There was almost no insulation. First rules to improve that started around 1974.
How does it work in Australia? Does gouv try to help people to improve that in old houses?
I guess it would be great for summer as I think it's pretty warm there.
I set temp to 18C when at home during the day, and 16/17C when away or night.
Bad insulation (empty air..), so if I lower too much it take hours to heat up again.
Traditional houses from the 70s are usually a basement and the house upstairs.
Basement is often half or totally underground.
Then the wall are made with cinder blocks, empty air and bricks.
There is chimney (not sure the term in English), so you can heat with wood, but most of the time there is central heating with Gaz or Fuel to replace or in complement.
How is it in your country ?