Ours is set to 80, but the indoor humidity ranges in the mid 50's. We have ceiling fans in all rooms and they keep the air moving nicely. Our unit usually starts running beginning around 10:00 am and goes off around 8:00 pm with an occasional cycle back on.
I do keep the condensor cleamed weekly and change the filter once a month.
Mine stays at 72. I know the bill is going to jump next month with all this heat but I don't care. Would I rather pay a little extra and be comfortable, or pay the same amount and sweat? Easy call...
Mine is at 76 during the day and we turn it down to 74 at night to sleep. I have a smaller one story house that is a newer build, insulated well, and the furnace and AC unit are pretty new, so even in this crazy heat, it doesn't run that much.