Dehumidifier Doesn't Deumidify Well (by 2 users)

If a dehumidifier seems incompetent, it may be undersized for the space. Check the unit's specifications to be sure it can handle the room size. If you don?t want to replace it with a larger one, try closing doors and dehumidifying your space a section at a time.

You can also:
1) Disconnect the power cord.

2) Remove the cover and clean the condenser and evaporator coils, as discussed above.

3) Lubricate the fan motor bearings with a couple of drops of oil if the motor has oil ports (some units don't need to be oiled). While you?re at it, make sure that the condenser isn?t clogged with dust or dirt.

4) If it still operates poorly, call an appliance repairperson for advice or take the unit into an appliance repair shop.