1. According to the driving mode, it can be divided into independent (a dedicated engine driven compressor with high cooling capacity and stable operation, but high cost, large volume and weight, mostly used in large and medium-sized buses) and non independent (air conditioning compressors are driven by car engines, and their refrigeration performance is greatly affected by engine operation, with poor stability, and are mostly used in small buses and sedans).

2 According to the performance of air conditioning, it can be divided into: single functional type (with refrigeration, heating, and ventilation systems installed separately, operated separately, and not interfering with each other, mostly used on large passenger cars and trucks) and integrated cooling and heating type (with refrigeration, heating, and ventilation sharing a blower and air duct, controlled on the same control panel. When working, it can be divided into combined cooling and heating systems that work separately, and mixed temperature regulation systems that can work simultaneously. Mixed temperature regulation is commonly used in cars) .

3. According to the control method, it can be divided into manual mode (using the function keys on the control panel to control temperature, wind speed, and direction) and electronic pneumatic regulation (using a vacuum control mechanism, when the air conditioning function key is selected, the temperature and air volume can be automatically controlled within the predetermined temperature range).

4. According to the adjustment method, it can be divided into fully automatic adjustment (using calculation and comparison circuits to control the operation of the adjustment mechanism through sensor signals and preset signals, automatically adjusting temperature and air volume) and fully automatic adjustment controlled by a microcomputer (using a microcomputer as the control center to achieve comprehensive and multifunctional optimal control and adjustment of the air environment inside the car).