Air conditioner and control method and device thereof, storage medium and computer program product

The invention provides an air conditioner and a control method and device thereof, a storage medium and a computer program product, and the method comprises the following steps: during refrigeration operation, when a temperature difference value between an indoor environment temperature and a set temperature of the air conditioner reaches a first preset multiple of a preset temperature difference value, firstly controlling the frequency of a compressor of the air conditioner to be reduced, and then controlling the frequency of the compressor to be reduced; the rotating speed of an inner fan and the rotating speed of an outer fan of the air conditioner are controlled to be reduced; in the heating operation process, when the temperature difference value between the set temperature of the air conditioner and the indoor environment temperature reaches the first preset multiple of the preset temperature difference value, the rotating speed of an inner draught fan of the air conditioner is controlled to be reduced,