Midi Slimline Dehumidifier 4 "RATHER NOISY" Mrs hague 03 February 2012 After reading the other reviews I was in two minds wether to buy this little machine, however apart from the noise it does the job quite well, if I am in the same room for a while I just turn it off so I don't have to listen to it. It would be handy to know how much electricity it uses per hour. A note from the team Thanks for placing your review. There are lots of websites that show you how to calculate how much electricity any electrical item uses. It depends on how long the item is switched on and what wattage it has, plus the charge your supplier makes for each Kwh of electricity.