Question: how much wattage does a portable air conditioner use?
Answer: About how much does it cost to operate a portable air conditioner? The average power consumption of portable AC units is about 1100 watts. At a national residential average of 10 cents per kilowatt-hour, that comes out to an energy use of 1.1 kW/h, or about 11 cents per hour, assuming it is running for the entire hour.