I'm about 3 weeks late to this thread... but here goes..
Before I moved my dad up into the house (he was in his own room downstairs), I set the programmable T-stat (A/C) for 80, daytime (while at work), 78 after getting home and 75 at night so I can sleep. If the outside temp is in the high 80's - low 90's range, the temp inside the house is just reaching 80 about or just after the time I get home from work. Heat in the winter I would set it for 58 (basically off) while at work and 65 while home.
If I wasn't trying to keep the cooling costs down I'd probably keep the A/C set for 70-72 while I'm home and 68 or so at night.
But now with dad in the house all day, when the A/C is on, it's at 78 daytime / 75 night. During the winter I keep it at 69 degrees during the day (I'm sure dad would prefer 75) and 60 at night.
Kevin