I'm not sure if they're common where you are, but this is what Thermostatic Radiator Valves are used for. You can set an approximate room temperature, and the v

I'm not sure if they're common where you are, but this is what Thermostatic Radiator Valves are used for. You can set an approximate room temperature, and the valve will open/close based on that. There are also smart ones now which can have a schedule applied to them, e.g. don't heat my bedroom during the day.