Question: how to calculate electricity cost for air conditioner?
Answer: First, determine the amps drawn by the unit. This will depend on the unit's size and SEER rating. ... 
Next, calculate the wattage consumed. A typical whole-home air conditioner uses a 240-volt power outlet. ... 
To find the kWh, divide by 1,000. 4,320 watts / 1,000 = 4.32 kWh.