Patent ID: 8909390

Claim:
A preliminary air conditioning system, comprising: a communication device that communicates with a motor vehicle that is equipped with an air conditioner that has a preliminary air conditioning function of controlling the temperature in the cabin of the motor vehicle before the motor vehicle is driven and a battery that stores electric power used by the motor vehicle; a charger that determines the state of charge of the battery based on the communication by the communication device and supplies electric power that is necessary to charge the battery to the motor vehicle from a building to charge the battery; a detector that detects a transition or a preparation for a transition from an unlocked state to a locked state of a door of the building, or a transition or preparation for a transition from a locked state to an unlocked state of a door of the building; and a controller that is configured to control the air conditioner to activate the preliminary air conditioning function using the communication by the communication device based on the result of detection by the detector when the communication device indicates that the detector has detected the locking or preparation for locking.