I didn't think my flat was 'damp' - there was a bit of condensation on the wall in one of the bedrooms, and a tendency for a slight mildew problem when the weather got colder. I purchased the Ebac 2650e to get rid of the mildew - and it has transformed the climate in my entire flat! The unit is very simple to use - let it run on 'Auto' setting for a couple of weeks - just switch it on and forget about it, it will adjust humidity levels automatically and remove as much moisture from the air as necessary for a healthy environment. I was quite surprised to be emptying the unit once a day at first, but as humidity levels decrease, it requires emptying less frequently. I now run it on 'economy' mode, and empty the reservoir a couple of times a week. My flat is quite large, and over two floors - ground floor and basement. I'd imagined that the dehumidifier would only work over one floor, but it seems to have gone to work on the entire flat. I used to have to run a mini-dehumidifier in my downstairs storage room, but this is now not needed. The downstairs bathroom feels cozy and dry, as does the rest of the flat. I really can't describe how much more comfortable the flat feels. I work from home several days a week, and usually by mid-October i have to run the heating all day in order to stay warm - no more - now the heating comes on for a total of 3 hours a day. All traces of mildew on the bedroom wall have completely vanished, and there is no sign of condensation. I haven't calculated how much electricity the unit uses - I'd imagine that it will be more than compensated by the savings on my gas bill - but I'm feeling so cozy and warm that I don't care! The unit itself is small and discrete and makes very little noise. I'm delighted with it, and wish I'd purchased one ages ago.