Upstairs has only one thermostat, on the landing but every room has a TRV on the radiators. The landing thermostat is always set at 18 and I can turn rads off in any unused upstairs room. There is no mould or damp in my house. I generally don`t leave any washing to air dry inside and the thermostat has not switched on yet
My sewing room is upstairs and my dyson heater will be in there, it will be warm in seconds and has a very efficient thermostat
Downstairs is very different, underfloor heating all over and 4 area thermostats. Utility and hall are set at 18, the kitchen/diner at 19 and the living room at 20. No area has needed ch yet. I have an efficient multi-fuel stove in my living room with an ecofan. I just leave the room doors open if I want gentle heat everywhere from the stove. That stove is serviced, flue swept. a large amount of logs and smokeless eggs in storage. I have not had any need to light it yet
Clothes and layers first for me, hand knitted woollen socks, warm tights, wool jumpers in particular and silk vests. It is just common sense