Converting BTUs to kilowatt-hours, a measurement equal to one kilowatt of power consumption per hour, you’ll find that a 7,500-BTU PAC consumes about 2.2 kWh, a 10,000-BTU unit 2.9 kWh, and a 14,000-BTU unit 4.1 kWh.Click to see full answer. Similarly, you may ask, do portable air conditioners use a lot of electricity?Depending upon its size (cooling capacity in Btuh), using a portable air conditioner may use just one-eighth as much electricity as your central air conditioner. For example, there is no need to keep the entire house cool at night when you can run a portable air conditioner in your bedroom.One may also ask, how much does a portable AC increase electric bill? Conclusion. For normal usage and average electricity cost it’s around $40 a month to run a 12,000 BTU air conditioner. Consequently, how many watts does a portable air conditioner use? For objective numbers, compare Frigidaire’s portable AC to the company’s window unit with the same capability—8,000 BTUs to cool 350 square feet. The window unit uses 6.2 amps and 708 watts in cool mode. The portable, 8 amps and 895 watts.Is it cheaper to run a portable air conditioner?You’ll find that both window and ductless AC units all have higher CEER and EER ratings, making them the cheaper choice for daily operation. The simple truth — Portable AC units will use more energy to hit your ideal cooling temperature.