I set mine at 66 when I go to sleep. I dont want to feel like im trying to sleep in a grass hut in Vietnam.
We set ours at 72 at night, but it is still 76 or so upstairs until after about 2 a.m.
If we set it at 66, I have to believe the AC would never shut off, all night.
When our AC died right before the 4th of July, the bedroom was 89 for 4 nights in a row.