said by Rxdoxx 
:said by Willy :The problem with to large a unit is it cools so fast that the room gets to cool then too warm as the unit goes on and off. You're not dehumidifying the room properly either.
Question. Would the larger unit be able to effectively run on a much lower setting? I know this is the case for my new dehumidifier, I have the fan speed on low, and it is a lot quieter (and more effective). Wondering if there can be a similar consideration that a larger unit could be effective on a low fan where a smaller unit would have to blast away noisily?
Under the right conditions, yes. Running a lower speed fan will create a colder evaporator coil which will remove more moisture and latent heat from the air. However, if the unit is grossly over-sized for the conditions and doesn't run long enough, it will not keep the humidity at acceptable levels even with lower fan speeds.
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