Electrical usage for air conditioners varies based on the Type and the Size of your air conditioner.
Window Air Conditioners use between 500 and 1400 watts depending on the AC unit size required, 400 or 1000 square feet, respectively, for the wattage shown above.
Portable air conditioners use between 2500 and 4000 watts per hour, depending on the size of the portable AC unit.
Mini-split air conditioners use 700-2000 watts per interior unit per hour. Mini-Split Air Conditioners, which are "ductless," use one outdoor unit (condenser) and are connected to one single or multiple interior wall-mounted air conditioners.  Mini-splits are designed to cool one room per mini-split interior unit.
Central air conditioners are the most energy-efficient AC types you can own and operate. Central AC will use approximately 1,000 watts of electricity per Ton.
Central air conditioners, typically installed in 2, 2.5, or 3-ton cooling capacities, i.e., a 2-ton central air conditioner, require 2000 watts of cooling capacity per hour of runtime.
Note:  Good Central air conditioning systems are manufactured with high-efficiency features, which will reduce the operation time and improve cooling efficiency.