A controlling system for an air conditioning apparatus includes a controlling apparatus, a main controller and room controller provided in each room. In the main controller, an operation mode changing means control the operations of a heat source device, an air blower and other devices through a controlling apparatus so that they perform any operation mode of "stop", "cooling", "warming", or "air blowing"; a temperature schedule inputting means is adapted to input a temperature schedule for each room by operating time keys and a temperature key; an interactive input means is to input initial data necessary to the operation of the system in a way of dialogue by operating "YES" key and "NO" key; a first display means is to display questions necessary to input the initial data and a temperature schedule; a schedule selecting means is to select a method of air-conditioning of the room provided with a main controller in accordance with information inputted by a schedule key; In the room controller, a mode selecting means is to select a method of air-conditioning of the room provided with a room controller in accordance with information inputted by a mode key; a room temperature setting means is to determine the room temperature of a room so that the room temperature is brought to a value inputted by a room temperature setting key, and a second displaying means is to display a room temperature and other information.