susiecb It depends where your main thermostat is. We have just had our boiler serviced and the advice from the engineer was - The main thermostat controls whether or not the boiler is on and supplying heat to the whole system, so if it is too low, the boiler cuts out too soon and no heat goes to the rooms. If it is in the hall, set it at the general temperature you want and leave doors open so that heat gets around. If individual room are not then exactly as you want them, adjust their radiator thermostats to suit. You can close doors if necessary once you get the balance right.