I think more important than when you turn on the AC is remembering to close your blinds/curtains around 10 AM if you can to reduce solar heating, and then opening windows at night if the outside temp dips lower than 70. That can make a huge difference on really hot days. The less work the AC has to do, the better it works! Most ACs have an energy saver mode where they will come on when the indoor temp reaches a set number. I would set it at 72-75 (depending on preference) and let it decide when to turn on and off.
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