Fremgangsmåde til drift af et varmesystem

A method for operating a heating system (1) is provided, said heating system (1) comprising a heat source (5) and in a room (2-4) at least a room heat ex- changer (6-8) which is connected to said heat source (5) and controlled thermo¬ statically by a control valve (11-13), said heat source (5) outputting a heating fluid having a supply temperature, said supply temperature being controlled ac¬ cording to a heat curve, said heat curve showing a relation between said supply temperature and an outdoor temperature, wherein the method comprises the step of adjusting said heat curve. The heat curve should be adjusted such that energy waste can be minimized while keeping the desired comfort temperature. To this end, the method comprising further the steps of determining the heat emitted in said room (2-4), comparing said emitted heat to a maximum level of heat emission, decreasing the slope of the heat curve, when the emitted heat is lower than a first predetermined fraction of the maximum level of heat emission, increasing the slope of the heat curve, when the emitted heat is above a second predetermined fraction of the maximum level of heat emission, and leaving the heat curve when the emitted heat is in a range between said first fraction and said second fraction of the maximum level of heat emission.