At the moment it's autumn (fall) here. I turned my A/C off at the switch in March this year. When the daytime temperature went under 32C (90F). I will not use again this winter as it s reverse cycle until it get below 10C (50F) and raining. I like to run my Summer A/C at 25C (78F) when my house equals the outside temperature of over 34C (92F). I mainly run it in a Heatwave when the temperature is over 38C (100F) all day and nights are still hot! That's very few days a year. Or when my feet are swollen from the heat.
In winter I will put extra jumpers on first, then if I am still cold then I may put the heater on at 18C (64F). The cost so far is about extra $20.00 in each a quarter when it's running. Our summer temperature wise can run from late September to early May.
Now we are back down to 25C to 13C at night.