Parking air conditioner is a kind of car air conditioner. It is a device that allows the air conditioner to run continuously with DC power (12V/24V/36V) from the vehicle battery while waiting or resting, and regulates and controls the temperature, humidity, flow rate and other parameters of the ambient air in the vehicle to fully meet the needs of the truck driver for comfortable cooling. It mainly includes: condenser, evaporator, electric control system, compressor, fan and piping system. The main structural forms are divided into two types: split and integrated.