International standards stipulate that commercial air conditioning is a collective term for air conditioning units of more than 3HP, so there are a wide range of product types involved in commercial air conditioning.

Unitary air conditioning units, in the form of large-capacity ceiling embedded, ducted, cabinet, etc., are mainly used in large open spaces, and small offices, entertainment, restaurants and other places.

Commercial air conditioning principle and the principle of domestic air conditioning are the same, the vast majority of liquid vapor refrigeration principle, just in the structure and layout is not the same, such as the use of fan coils, the use of water to the room to the cold, rather than directly to the evaporator located in the room. In addition, because commercial air conditioners require large refrigeration capacity, in addition to the use of ordinary vapor compression type, the use of vapor absorption type, such as NH3-H2O solution and LiBr-H2O solution. In addition, there is also the use of steam injection, mainly in the steam source of convenient thermal power plants and other places to use.