The water produced during dehumidification is collected in an internal container of the appliance, which must be emptied regularly. Alternatively, a drain hose can be connected to some mobile air conditioners to continuously drain the water; please refer to the operating instructions to check whether this is possible with the model mentioned.

The appliance does not necessarily have to be positioned directly at the window, but the exhaust air hose must be routed to the outside, typically through a window, so that the warm air can be discharged. A window sealing set is usually used for this purpose to guide the hose safely and tightly out of the window. A fixed window position is therefore necessary to position the exhaust air hose correctly.