A system for heating and/or ventilation and/or air-conditioning, the system comprising an appliance (2a - 2d), a control assembly (3a - 3d, 4a - 4d) in operative communication with the appliance (2a - 2d), a first motor (5a - 5d) in operative communication with the control assembly (3a - 3d, 4a - 4d), and a second motor (6a - 6d) in operative communication with the control assembly (3a - 3d, 4a - 4d), wherein the first motor (5a - 5d) acts on a coolant and/or heating medium flowing through the system and has a first winding having a first terminal and a second terminal; wherein the second motor (6a - 6d) acts on a coolant and/or heating medium flowing through the system and has a first winding having a first terminal and a second terminal; wherein the first winding of the first motor (5a - 5d) is different from the first winding of the second motor (6a - 6d); the control assembly (3a - 3d, 4a - 4d) being configured to: apply a first electric signal selected from an electric high signal and an electric low signal to the first terminal of the first winding of the first motor (5a - 5d) for a first number of regular intervals of time; after the application of the first electric signal to the first terminal of the first winding of the first motor (5a - 5d), apply a second electric signal selected from an electric low signal and an electric high signal to the first terminal of the first winding of the first motor (5a - 5d), the second electric signal being different from the first electric signal; apply the first electric signal to the first terminal of the first winding of the second motor (6a - 6d) for a second number of regular intervals of time; and after the application of the first electric signal to the first terminal of the first winding of the second motor (6a - 6d), apply the second electric signal to the first terminal of the first winding of the second motor (6a - 6d); characterised in that the first number of regular intervals of time and the second number of regular intervals of time differ by one regular interval of time. wherein the first motor (5a - 5d) acts on a coolant and/or heating medium flowing through the system and has a first winding having a first terminal and a second terminal; wherein the second motor (6a - 6d) acts on a coolant and/or heating medium flowing through the system and has a first winding having a first terminal and a second terminal; wherein the first winding of the first motor (5a - 5d) is different from the first winding of the second motor (6a - 6d); the control assembly (3a - 3d, 4a - 4d) being configured to: apply a first electric signal selected from an electric high signal and an electric low signal to the first terminal of the first winding of the first motor (5a - 5d) for a first number of regular intervals of time; after the application of the first electric signal to the first terminal of the first winding of the first motor (5a - 5d), apply a second electric signal selected from an electric low signal and an electric high signal to the first terminal of the first winding of the first motor (5a - 5d), the second electric signal being different from the first electric signal; apply the first electric signal to the first terminal of the first winding of the second motor (6a - 6d) for a second number of regular intervals of time; and after the application of the first electric signal to the first terminal of the first winding of the second motor (6a - 6d), apply the second electric signal to the first terminal of the first winding of the second motor (6a - 6d); characterised in that the first number of regular intervals of time and the second number of regular intervals of time differ by one regular interval of time. apply a first electric signal selected from an electric high signal and an electric low signal to the first terminal of the first winding of the first motor (5a - 5d) for a first number of regular intervals of time; after the application of the first electric signal to the first terminal of the first winding of the first motor (5a - 5d), apply a second electric signal selected from an electric low signal and an electric high signal to the first terminal of the first winding of the first motor (5a - 5d), the second electric signal being different from the first electric signal; apply the first electric signal to the first terminal of the first winding of the second motor (6a - 6d) for a second number of regular intervals of time; and after the application of the first electric signal to the first terminal of the first winding of the second motor (6a - 6d), apply the second electric signal to the first terminal of the first winding of the second motor (6a - 6d); characterised in that the first number of regular intervals of time and the second number of regular intervals of time differ by one regular interval of time.