our house is always cold, because 1.we're poor, and 2.we're never really home. i believe that room temp is 20C, but ours is usually closer to 15C or something.
well it's a hell of a lot warmer than outside... we're already covered in snow up here, it's bloody expensive to heat the house to 20C all winter.
Usually at about 70 F. It is easy to keep it at that temperature since it's pretty mild here. If the sun comes out it will get significantly hotter though.
room temperature. er, warm. heat's included in our rent, so we keep the house toasty toasty warm (23C usually.)
up until about 15 years ago, between 68 and 70.5 (f) was just right. now my old bones seem to be happiest arround 75 (that the thermostat defaults to if i don't reset it every time we have to switch over between heating and cooling and back again) i just hope i never have too keep it at the 80 or above my mother has always insisted upon. (when we had our own place up in colfax back in the early 60's there were two seperate little cabins on it. she slept in the big one and i in the smaller one where my dad would often come out to do so as well. now she lives six blocs up the street and i live with a wife who fortunately is comfortable at prety much the same temperatures as i am) =^^= .../\...
I really have no idea (stupid dorm room) and not much choice either. It's either way too hot or way too cold. I prefer way too cold though. I can always add some more clothes...