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The bigger ones like mine are supposed to be good up to 2-3 bedroom houses. As the room it is in dries, the moisture is drawn out of the others. If it's a shared house, have you considered chipping in for a communal one? The benefits will be shared anyway; clothes dry faster, house heats up quicker etc. Also, chances are if you only try to dehumidify your room, you will draw in moisture from the rest of the house anyway as soon as you open your door.
Hmm, that seems to only remove 250ml of water per day whereas something a bit more expensive will remove 8l, seems like it's worth spending a bit extra. Cheers for the tips, I've lived in this house for 2 years, don't know what's changed to make my room suddenly start getting damp.