An airconditioner consists of heat pump type freezing cycle equipment comprising a rotary compressor having a guide port open to the interior of its cylinder; a refrigerant flow-changing valve; an indoor heat exchanger; a first decompressing device; a gas-liquid separator; a second decompressing device; an outdoor heat exchanger, all communicating with each other in the order mentioned. And an injection passage in the guide port communicates with the gas-liquid separator so that a gas refrigerant is injected from the gas-liquid separator into the cylinder through the guide port.