Hi, sorry for being a pain and maybe asking a stupid question. My aunt is having trouble sleeping in this heat, its ok at moment but with another heatwave expected. She wants to move her free standing fan into the bedroom but has a couple of questions that I can't answer relating to health and safety and cost (as elec is so exp now) questions are below and any response would be very much appreciated. 1. is it ok to run for 7-8 hours at a time? 2. what is approx units used per hour (on lowest setting) 3. what is approx cost of a unit per hour thanks!!!