Loading ...You don’t have to get central air, they have portable systems of different kinds including solar that can be set to automatically turn on at a certain temp.
Yes I read things about different sleeping hours but in extreme heat it’s not going to make much difference. In the US I never looked into sleeping hours but do know it used to be heavy in agricultural so plowing fields and tending to livestock amongst making or trading their own things or amongst each other was done during the day on natures clock so to speak. When industrial slavery came around in inner cities they just kept those hours.
In a billion years as sun starts to turn into a red giant it will get to about 150F at first and so for life forms to add more years on earth they would probably have to live underground and find underground water sources. Those will be end times before the sun absorbs earth.