An adjustment device for the self-regulating adjustment of a flow control valve of a consumer loop with heat exchanger in a temperature control system for rooms in a building, having a temperature control source , a liquid heat carrier and a pump , wherein the adjustment device comprises: an electrically controllable actuator configured to be coupled to the flow control valve in such a way that an opening position of the flow control valve can be adjusted and detected, gradually or stepwise, between a closed position and an open position by the adjustment device ; temperature detection means which detect a flow temperature (T flow ) on the input side and a return temperature (T return flow ) on the output side with respect to the consumer loop of the heat carrier flowing through; calculation means configured to calculate an electric trigger of the actuator , which corresponds to a predetermined opening position of the flow control valve - associated with a specific flow cross-section - based on a control difference (ΔT control difference ), wherein the control difference (ΔT control difference) to be calculated is formed between a temperature difference (ΔT actual ) from the input-side flow temperature (T flow ) and the output-side return flow temperature (T return flow ) detected by the temperature detection means , and a temperature spread (ΔT taget ) from the output-side return flow temperature (T return flow ) to the input-side flow temperature (T flow ) that is predetermined by the calculation means , that is the absolute value of the difference ΔT target minus ΔT actual ; an interface for receiving an external activation signal for activating the calculation means and/or the adjustment device ; characterized in that, said adjustment device comprises time detection means and storage means configured to detect and store a previous or current activation period of said activation signal and/or a deactivation period between two activations; and the calculation means is configured to variably determine the temperature spread (ΔT taget ) based on the activation duration and/or the deactivation duration. an electrically controllable actuator configured to be coupled to the flow control valve in such a way that an opening position of the flow control valve can be adjusted and detected, gradually or stepwise, between a closed position and an open position by the adjustment device ; temperature detection means which detect a flow temperature (T flow ) on the input side and a return temperature (T return flow ) on the output side with respect to the consumer loop of the heat carrier flowing through; calculation means configured to calculate an electric trigger of the actuator , which corresponds to a predetermined opening position of the flow control valve - associated with a specific flow cross-section - based on a control difference (ΔT control difference ), wherein the control difference (ΔT control difference) to be calculated is formed between a temperature difference (ΔT actual ) from the input-side flow temperature (T flow ) and the output-side return flow temperature (T return flow ) detected by the temperature detection means , and a temperature spread (ΔT taget ) from the output-side return flow temperature (T return flow ) to the input-side flow temperature (T flow ) that is predetermined by the calculation means , that is the absolute value of the difference ΔT target minus ΔT actual ; an interface for receiving an external activation signal for activating the calculation means and/or the adjustment device ; characterized in that, said adjustment device comprises time detection means and storage means configured to detect and store a previous or current activation period of said activation signal and/or a deactivation period between two activations; and the calculation means is configured to variably determine the temperature spread (ΔT taget ) based on the activation duration and/or the deactivation duration. <EOS>