A method of maintaining a position of an airflow-direction control element of a heating ventilating and air conditioning (HVAC) system is provided. The method comprises the steps of, a) determining a position of at least one movable member of an airflow-direction control mechanism of the HVAC system; and b) calculating whether the movable member is at a target position associated with a required position of the airflow-direction control element, and if not, activating an airflow-direction-controller actuator of the HVAC system to effect a change in the position of the movable member. The actuator of the HVAC system has a high efficiency and can reduce power consumption of the system.