The difference between commercial air conditioning and residential AC is the level of energy needed. Businesses not only (often) take up much space than residences, they also have to provide comfortable accommodation for more people at once. Because the human body produces heat, commercial ACs have to be designed to combat the excess heat in a workspace, both customers and employees alike. Another important consideration is that unlike residential AC, industrial (and large commercial) ACs are required to have their temperature controller optimised for the different conditions that the building is in, such as extreme cold or high humidity. A third factor is that industrial ACs are required to also meet emissions regulations, although this is often done away with when operating in commercial buildings.
A more common type of commercial air conditioning unit is the single-split system. A single-split system is made up of one large air conditioning unit (a single tower), along with several smaller units on the property (sometimes grouped together). A popular method of installation in residential buildings (in which there is only one tower) uses twin-wave AC systems. As the name suggests, the cooling unit (which sits at the top of the tower) functions in tandem with the larger central cooling unit, which operates much like a refrigerator in that it continually cools down the stored water in the towers.
For businesses which may have multiple floors, a commercial air conditioner may be an ideal solution. These cooling systems can often be installed on rooftops and in many cases are provided with cables that run directly to the desired floor. Even if an establishment does not have a rooftop for the installation of its commercial air conditioning system, many of them can be retrofitted to work in covered porches or other areas which may be out of the way. Many newer models are also equipped with emergency stop buttons, allowing them to be manually switched to a manual mode in the event of an emergency.