HeatingSave building energy management system cut heating costs because it accurately watches the climbing room temperatures and switches off the heat, using the residual heat within the boiler, to reach the correct room temperature. Thermostats cannot do this and always overshoot the temperature, wasting fuel and leading to that 'turn the heating up, then open a window' syndrome. Fitting sensors to fire station doors further reduces fuel costs as HeatingSave automatically cuts the heating to the fire engine bay area when the doors are open.