In our last house the (mains gas) CH was always on, with the thermostat set at 20. If it was cold, it came on. But the house was well insulated and pretty new. Gas cost was pretty negligable, in that if you were warm, you’d open a window.
Now, our new house is a 150 y/o converted mill with an AGA at one end and electric storage heaters elsewhere – it is though well insulated. The AGA is always on (circa £200 pcm for oil). We’re going to install a multifuel stove at the other end. This along with the economy 7 should keep us warm, although the QE2 is probably cheap to fuel…
And I’ve starting wearing long sleeved items 😉
And we’ve moved from the SE to Scotland, so that probably reduces the average temp by 5c.