Question: how much electricity does a big fan use?
Answer: Normal household fans will have a wattage of between 25 and 75, with the lower end of that scale costing around £0.004 per hour and the highest around £0.012. At most, with the highest wattage fan you are likely to have in your home, it would cost around £1 to run a fan for 12 hours per night for an entire week.