Human occupancy-based control system for an air conditioning system

An air conditioning system comprising a plurality of refrigerant systems respectively including one indoor unit connected to one outdoor unit by a refrigerant pipe, and configured to control the plurality of refrigerant systems by one remote controller, wherein

• the indoor unit includes a human sensor and a power supply, the power supply being configured to power both the human sensor and the indoor unit,
• the indoor unit is configured to transmit an absence signal to the remote controller when the air conditioning system is in an on-state and detection information of the human sensor indicates absence,
• the remote controller that has received the absence signal is configured to transmit an absence-off period signal including absence-off period control information set in advance to the indoor unit, and
• the indoor unit that has received the absence-off period signal is configured to be controlled according to the absence-off period control information, wherein
• the human sensor in each of the indoor units is configured to turn off when a corresponding indoor unit is turned off.