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A dehumidifier runs as a closed loop: it turns the moisture it takes from the room into water and returns dry air. If the room leaks outside air, the unit also has to deal with the new moisture coming in; carpets dry slowly and power consumption rises. Insulation matters as much as the machine.
Walls and ceiling
All interior surfaces are lined with compressed polystyrene. Joints are taped and no gaps are left. The ceiling loses the most heat, so its thickness is never reduced.
Floor
Polystyrene alone gets crushed. Use a hard, load-bearing material such as sandwich panel on the floor; it insulates and withstands trolley and hanger traffic. Plan a slight slope and a drain for the condensate.
Door
The door is the most neglected point. Use an insulated door with a gasket that seats on the frame. If the room must be opened often, a small vestibule cuts moisture leakage.
Hanger layout
Carpets hang on rails spaced 12–13 cm apart without touching each other. The unit’s airflow should run parallel to the hanger rows, with at least 40 cm clearance behind the unit.