一般空调机由于电源频率50Hz是固定的，所以压缩机的转速是固定的，也就是被称为“空调机血液”的冷媒（氟利昂）的循环是恒量的，在一定时间内冷媒的循环量越大，空调机的输出功率就越高。也就是说，压缩机的转速决定了空调机的输出功率。
而变频空调是一种使用变频压缩机和模糊控制技术的空调器，能根据室内气温的变化，调节制冷速度。具有低噪音、耗能低等特点。一个15平方米的房间，变频空调比定频式调温速度快6－10分钟。达到设定温度后，变频空调又能以仅为定频空调10％的功率低速运转，以调节温度细微损耗，维持恒温状态。试验显示，较之定频空调，变频空调噪音低5－6分贝，寿命长5－8年，是空调市场未来的发展方向。Generally, since the power supply frequency is fixed at 50 Hz, the rotation speed of the compressor is fixed, that is, the circulation of the refrigerant (Freon) called "air conditioner blood" is constant, and the circulation amount of the refrigerant is constant for a certain period of time. Large, the output power of the air conditioner is higher. That is to say, the speed of the compressor determines the output power of the air conditioner.
Inverter air conditioner is an air conditioner that uses inverter compressor and fuzzy control technology to adjust the cooling speed according to the change of indoor air temperature. It has low noise and low energy consumption. A 15 square meter room, inverter air conditioner is 6-10 minutes faster than the fixed frequency temperature regulation. After reaching the set temperature, the inverter air conditioner can operate at a low speed of only 10% of the fixed-frequency air conditioner to adjust the temperature loss and maintain the constant temperature state. Tests show that compared with fixed-frequency air conditioners, inverter air conditioners have a low noise of 5-6 decibels and a long life of 5-8 years, which is the future development direction of the air conditioner market.