Question: how much electricity does a 2.5 kw air conditioner?
Answer: A 2.5 kW system running for 4 hours a day would costs approx. $40.11 per year to run or 47.75 cents a day or 11.9c per hour. 2. A 3.5 kW system running for 8 hours a day for 12 weeks (84 days) of the year at 24 degrees will cost appox.