PURE air conditioners are generally recommended to be replaced every 12 months or 15,000 kilometers, which need to be adjusted according to the environment: in northern sandy and dusty areas, it is shortened to 8 months/10,000 kilometers, and in humid areas in the south that need to prevent mildew and mildew, it is recommended to replace them every 10 months. The replacement time can be determined by detecting a 30% drop in the air output of the air conditioner, a drop in cooling efficiency, or the appearance of an earthy smell.