Ah, that makes sense.
I do have the heating on right now. Even got it high, for my standards, 19ºC. I'm wearing a pullover, a scarf and carry a hot gel bag in my neck. Clearly the flu.
Past weeks, I have put on the heating in the evening once or twice, not even for the temperature, but to chase the humidity from the house. Having the heating just one degree over the actual temperature, for half an hour, with windows ajar, makes all the difference needed to get a good atmosphere again.
I have no rules for time, when the heating goes on. Just do not want to sit in the evening in a room at a temperature of 16 degrees Celcius. In the mornings that temperature is fine. If the weather stays soft for a long time, it may be deep in November before I turn the heating on during the day. If the weather cools down rapidly next week, then I won't wait till November.