The major difference between residential and commercial air conditioners is the amount of power used. Business set ups takes up more space and the number of people in a commercial space is more than a residential building. Hence, the heat dissipated from human bodies is a lot more than in residential buildings. Thus, it is evident that a more powerful air conditioner is required to remove the heat that gets emitted in a commercial set up. Sizing a commercial air conditioner properly, is important and it can be correctly done by an HVAC technician.