JP2825945B

PURPOSE:To perform proper defrosting operation and to realize comfortable air conditioning without reducing a room temperature by a method wherein the more a hot air discharge starting time after completion of defrosting is longer, and the more a temperature difference between the detecting temperature of a room temperature sensor and the set temperature of a room temperature setter is increased, the more a heating operation time is decreased. CONSTITUTION:A temperature difference detecting device 7 detects a temperature difference between the detecting temperature of a room temperature sensor 5 and the set temperature of a room temperature setter 6. An air conditioning control device 12 sets a heating operation time based on the detecting result of the temperature difference detecting device 7 and the detecting result of a hot air discharge time detecting device 9, and when the detecting time of an operation time integrating device 8 attains a preset heating operation time, defrosting operation of an air conditioner is started. In an air conditioning control device 12, the more a hot air discharge starting time after completion of defrosting is longer and the more a temperature difference between the detecting temperature of the room temperature sensor 5 and the set temperature of an indoor temperature setter 6 is higher, the more a heating operation time is set to a lower value, whereby proper defrosting operation is performed. When proper defrosting operation is effected, defrosting is decreased, deficiency in capacity due to frosting and the increase of a defrosting time are prevented from occurring, and a room temperature can be prevented from lowering.