Provided are an air conditioning device and method. The air conditioning control device includes a ventilation fan, a memory storing at least one instruction, and at least one processor connected to the memory, in which the at least one processor is configured to, by executing the at least one instruction, determine, among a plurality of rooms, a first room from which thermal energy is to be recovered and a second room to which the thermal energy to be recovered is to be supplied, based on at least one of a sensor value of a sensor in a room among the plurality of rooms, a use schedule of at least one room among the plurality of rooms, and a user input, and drive the ventilation fan to exchange thermal energy of the first room and thermal energy of the second room.