The whole reason for installing an efficient, sufficiently powerful AC system at home is so you can still enjoy a temperate climate indoors even when the sun is searing hot outside during the day, or the nights are hot and sticky.
It's all about maintaining an even temperature throughout the year, when you think about it.
A lot of folks make the mistake of setting their thermostat way too low in summer so their home feels like it's located at the north pole rather than being sited in a comfortable warm climate.
That just wastes energy in spades and contributes to a massive electricity utility bill be looking forward to at the end of the summer!
The sensible way to approach AC is to set the thermostat to a real comfortable level that you can relax with indoors when it's real hot outside, but not so cold that you feel you need to put on a sweater because you can see your breath when you exhale!
The exact setting will be down to personal preference, but somewhere in the low 70s is about right for most folks.
It's just a case of figuring out what is a comfortable temperature for you.
As a kind of obvious example, take what you'd consider to be comfortable during winter so you don't feel cold indoors. Then set the thermostat to the same temperature in summer (so you don't feel cold)!
