AIR CONDITIONER

An air conditioner includes: a heat pump cycle including a compressor, a heating part and a low-temperature side water-refrigerant heat exchanger; a heat medium circuit; and a blower. In the air conditioner, when a heating capability of the heating part is increased by using the heat generated by the heat generating part, a heating preparation control is executed, in which a refrigerant discharge capability of the compressor is set to be equal to or less than a predetermined reference discharge capability and a blowing capability of the blower is set to be equal to or less than a predetermined reference blowing capability, until an inlet-side heat medium temperature of the heat medium flowing into the heat medium passage of the low-temperature side water-refrigerant heat exchanger becomes equal to or higher than a target heat medium temperature.