PURPOSE: To obtain an air-conditioning machine capable of synchronizing with heating operation and controlling a humidifier operated in synchronism with the ventilating operation of an air-conditioning chamber by a method wherein a humidifying operation control switch, synchronized with a switch for controlling the ventilating operation and effecting the humidifying operation when a heating operation control switch is closed, is provided.

CONSTITUTION: Upon heating operation, a switch 4 is operated and a solenoid valve 1 is conducted. At the same time, another switch 5, operated by a ventilating operation signal to make a closed circuit, is operated, a motor 3 for a fan is conducted and the ventilating operation is effected to heat an air-conditioning chamber. A humidifier 2, connected in parallel tot he solenoid valve 1, is operated in synchronizing with the switch 5 and another switch 6, making a closed circuit, is connected in series, therefore, humidifying operation is effected only upon an operation in which the switch 4 and the switch 6 are closed simultaneously. When the ventilating operation is intercepted by the operation of a thermostat during heating operation or the stop of the fan motor 3 effected by the returning operation or the stop of the fan motor 3 effected by the returning operation of the switch 5 effected by a cool air feeling preventing means during the defrosting operation of a refrigerant circuit, the switch 6, operating in synchronizing with the switch 5, is returned whereby the humidifier 2 is put OFF and the humidifying operation is intercepted.