Heating and cooling air conditioner

The utility model discloses a heating and cooling air conditioner, include: double -cylinder compressor, switching -over subassembly, outdoor heat exchanger, indoor heat exchanger and vapour and liquid separator, double -cylinder compressor include first cylinder, second cylinder, first reservoir and second reservoir, the induction port and the first reservoir intercommunication of first cylinder, and the induction port and the second reservoir intercommunication of second cylinder, the value range of the exhaust volume ratio of second cylinder and first cylinder is 1%~10%, the switching -over subassembly includes first valve port to fourth valve port, and the fourth valve port links to each other with first reservoir, vapour and liquid separator includes gas outlet, first interface and second interface, and the gas outlet links to each other with the second reservoir, and it has an aperture adjustable throttling element to establish ties between first interface and the outdoor heat exchanger, and it has the