@Puffalicious
There needs to be a happy medium between 23 and folk with no heating all day, OP! I'm a cold person and have it at 21 degrees 6:30-8:00 and 5:00-10:00. All other times it's set at 17. It's a system that the radiators only click on if the radiant temp is below 17, which is quite rare. We live in an old house, but the big, steel, traditional radiators DH fitted (he's a plumber!) are amazing- heat rooms brilliantly and retain hear. We have quite a big house and energy bills are quite high, but we'd rather spend money on a warm house than other things.
I don't think that's rare at all, in terms of the heating system, that's how thermostats work!
Maybe some people here are misunderstanding things if some people think that is a fair system. It's pretty standard for places I have lived.
So when I say I have my heating set to 20 degrees all year, it means that if the temperature in the house ever goes below that, the heating clicks on. If it is above that, it turns itself off. I want an ambient, comfortable (for me and my children with our temperature tolerances) temp in here all year.
One Christmas not long ago it was 13 degrees outside which was the same average daytime temp over the whole of July! UK weather is unpredictable. I do not wish to be cold summer or winter (and am lucky these days to have the choice).
It means the heating is on very rarely in the summer, obviously. It would only come on if the house got cold... and we don't enjoy being cold at any time of year, so why would we change it in summer? But last summer one day there was a hailstorm, so I presume that day it was probably on for a while! I didn't check so don't know.
Most people have a temperature they are comfortable at, and will use extra layers/ heating/ their fire/ open windows/ fans/ air con if they are in a climate that requires it to try to make their home comfortable, to them.
Setting a thermostat to 20 and leaving it there does not mean your heating is on constantly summer and winter. It comes on only when the temperature falls below that!