Air conditioner system

An air conditioner system, comprising:

• a temperature regulator configured to regulate a temperature of an indoor air;
• an indoor air temperature detector configured to detect the temperature of the indoor air;
• and
• a control unit configured to set a target temperature based on a predetermined reference temperature and to control the temperature regulator so that the temperature detected by the indoor air temperature detector approaches the target temperature, wherein
• the control unit runs in a first mode to sequentially perform a first operation of lowering the target temperature to a first target temperature lower than the reference temperature and a second operation of raising the target temperature to a second target temperature higher than the reference temperature, each at least once, and
• in the first operation, the control unit lowers the target temperature to the first target temperature in a shorter time than a time when the target temperature is raised to the second target temperature in the second operation, to decrease the temperature detected by the indoor air temperature detector toward the first target temperature over a first predetermined period, and in the second operation, in order for the first operation to give a cool stimulus to a user and prevent the user from feeling drowsy, the control unit gradually raises the target temperature from the first target temperature to the second target temperature, to increase the temperature detected by the indoor air temperature detector toward the second target temperature over a second predetermined period longer than the first predetermined period.