Moiraine

80 is about the point where I start to sweat after a while (depending on humidity), so 78 or so is about my upper limit during the summer. The area where my computer sits tends to be the hottest part of my home, though, so the thermostat might be at more like 74.

Depends on who is paying the bill.

Otherwise, whatever you are comfortable with.

78 Degrees in Summer

72 Degrees in Winter 

Convince me otherwise.