Over a pint at lunch time I casually mentioned that I might increase my thermostat setting from 19C. Everyone around the table looked at me in disbelief and announced their temps which were between 14-18C. I was really rather surprised at this as I didn't think I was being particularly profligate with my heating.
When I get up I turn it up to 22, but if I still feel a bit cold I put it to 24. When I go out or when I go to bed I put it back to 16.
It probably depends where you live and also if your double glazing is any good.