The working principle of air conditioner is similar to the traditional central air conditioner. It is a kind of mobile air conditioner which can improve the traditional design concept. It is small and exquisite, with high energy efficiency level and no installation. It can be placed in different address at will. The working principle and characteristics of air-conditioner are similar to those of general central air-conditioning, and there are all kinds of equipment in human body, such as refrigeration compressor, exhaust fan, electric water heater, air-conditioning evaporator, air-cooled fin built-in cooler, etc. The difference between the two is that four universal wheels are installed on the shell base of the portable air conditioner, which can move the central air conditioner at will.