Turning on the heat

Had the heating on for an hour the other day because my OH was still feeling poorly with covid, but ordinarily will not put it on before november, and only then if is really cold.
My house temp can get as low as 15, same as another poster said, but we have electric over blankets which are cheap to run and nice and toasty, also hot water bottles and nice soft blankets.
Also keeping active is good, going for walks etc., sitting in once spot can make you feel colder imho.

Our heating is never turned off
It is set at 21 so even if the temperature drops below that in July it would come on.

WHO recommendation for anyone over 65 is a MINIMUM temperature of 64.5F or 18C. The optimum temperature range is 18-21C. Lower temperatures increase the risk of flu. respiratory disease, high blood pressure, heart attacks etc.

I keep my thermostat at 19C.

The cars were frozen over at 5am and I checked my phone which said 2%.
I have had the heating on low all day.
We are in the north.

Our heating is set on 20, and at the moment comes on for just an hour first thing in the morning. We have a wood burner in the living room. If we open all the doors it heats the whole house. We have a large conservatory with an air heat pump, which works extremely well, and is cheap to run. If it gets perishing we both have heavy knitted blankets ,I made some years ago. So mostly we are toasty

No heating here only hot water bottles