Heating is "on" all the while here (summer too) and I haven't "moved" our thermostat since fitting it. It's set at 18 (64) day and 15 (59) after 12 till about 6. Seems to work out OK for us. In the winter, the main living room has a woodburner which is lit during the day and if I'm up later in my room and get cold, sometimes I use an electric heater for that bit although I may also use an extra jumper instead.

I've heard the heating fire up a couple of times at night lately but it's still not that cold. Thermometer in my room is reading 19 (66) as I type.

One thing I'm convinced made a big difference here (and as Peter is disabled was done for free - Warm Front (UK)) was to have the cavity walls insulated and the roof insulation brought up to current standards.

Just checking outside temp...It's 10 (50) in the sheds.