Method for adjusting the operating state of a circulatory system of a ventilation, preferably a ventilation system, - wherein the circulatory system comprises a heat absorption region and a heat emission region, and wherein the heat absorption region and the heat emission region are connected by means of at least one line to form a closed circuit through which a carrier medium flows, - wherein at least one heat exchanger is arranged in the heat absorption region, by means of which heat is transferred from a hot air volume flow to the carrier medium flowing in the line, wherein the heat exchanger is assigned a valve, which can be controlled by a drive means, in order to change the quantity of carrier medium flowing through this heat exchanger, - wherein at least one heat exchanger is arranged in the heat emission region, by means of which heat is transferred from the carrier medium flowing in the line into a cold air volume flow, wherein the heat exchanger is assigned a valve, which can be controlled by a drive means, in order to change the quantity of carrier medium flowing through this heat exchanger, - wherein, in order to achieve a flow, at least one regulated pump is provided in the line, preferably in one of the two transfer regions, and - wherein each drive means can be actuated by means of a control device or regulating device, - wherein at least one further heat exchanger is arranged in the heat absorption region and in the heat emission region, and is arranged in parallel to the heat exchanger from a flow point of view, wherein the further heat exchanger is assigned a valve, which can be controlled by means of a drive means, in order to change the quantity of carrier medium flowing through said further heat exchanger, characterised in that, during the operation of the circulatory system, at least one valve of a heat exchanger arranged in the heat absorption region is moved fully into its open position and remains unchanged in its open position, and at least one valve of a heat exchanger arranged in the heat absorption region is not fully open, and at least one valve of a heat exchanger arranged in the heat emission region is moved fully in its open position, and remains unchanged in its open position, and at least one valve of a heat exchanger arranged in the heat emission region is not fully open. - wherein the circulatory system comprises a heat absorption region and a heat emission region, and wherein the heat absorption region and the heat emission region are connected by means of at least one line to form a closed circuit through which a carrier medium flows, - wherein at least one heat exchanger is arranged in the heat absorption region, by means of which heat is transferred from a hot air volume flow to the carrier medium flowing in the line, wherein the heat exchanger is assigned a valve, which can be controlled by a drive means, in order to change the quantity of carrier medium flowing through this heat exchanger, - wherein at least one heat exchanger is arranged in the heat emission region, by means of which heat is transferred from the carrier medium flowing in the line into a cold air volume flow, wherein the heat exchanger is assigned a valve, which can be controlled by a drive means, in order to change the quantity of carrier medium flowing through this heat exchanger, - wherein, in order to achieve a flow, at least one regulated pump is provided in the line, preferably in one of the two transfer regions, and - wherein each drive means can be actuated by means of a control device or regulating device, - wherein at least one further heat exchanger is arranged in the heat absorption region and in the heat emission region, and is arranged in parallel to the heat exchanger from a flow point of view, wherein the further heat exchanger is assigned a valve, which can be controlled by means of a drive means, in order to change the quantity of carrier medium flowing through said further heat exchanger,