Dreo 20L/Day Smart Dehumidifier Review: price, specs and verdict (2026)

In a bedroom, set the app to auto at about 50% and use the schedule to run the machine for an hour or two before bed. Overnight, the humidity will sit steady and the fan will only run in short bursts. The 38 dB sound-pressure figure means that on the low speed it fades into the background for most sleepers, but a machine this size moving 20 litres a day is never completely silent, so keep it a metre or so from the bed.

For laundry, close the door of a small room, put the airer in the middle and the dehumidifier in the corner, and use the laundry mode. A load of washing will be dry in several hours, and the compressor will often collect a lot of water in that time. Because the tank is 3.4 litres, fit the drain hose for laundry sessions so the machine does not stop part-way through.

For a bathroom or shower room, run the machine after showers with the door shut. Steam and condensation clear quickly, and the humidity reading on the app tells you when it has finished. Keep the unit out of splash range and leave a gap around the grille.

For a home office or a room that is only a little damp, auto mode at 55% is enough. Do not set a target below about 40%, as the compressor will run constantly without helping, and the room becomes uncomfortably dry.

A 20 litre compressor can lower a normal room to the mid-40s percent, but not much lower. If you need very dry air, such as a greenhouse or a tool store, a desiccant model is the right choice. Empty and rinse the tank every couple of weeks and wash the filter when dust builds up, drying it completely before refitting.

Dreo is best known for fans, heaters and air purifiers, and its dehumidifier brings the same design approach: a tidy, slim body, a clear display and an app that works. The 20 litre model is a compressor unit, rated to remove up to 20 litres of water a day from the air, with an efficiency of up to 2.3 litres per kWh.

The headline figure is the noise. Dreo quotes 38 dB as the sound pressure level, measured at a distance, and 50 dB as the sound power level, which is the figure that compares fairly with other manufacturers. On either number it is on the quieter side of the 20 litre class, and it has three fan speeds to trade noise against speed.

Control is by a digital panel or by the Wi-Fi app. The app shows the live humidity, lets you set a target in auto mode, and supports a full weekly schedule, so you can have the machine run only when you are out or before you wake. A laundry mode runs the fan hard to dry washing, and a 24-hour timer covers simple jobs.

At 12.4 kg it is not light, but the castors and the carry handle make it easy to shift between rooms. The 3.4 litre tank is the compromise. It shuts the machine off when full, so for long sessions you should use the continuous drainage option.

It suits flats and family homes where one machine has to do bedroom duty overnight and laundry duty by day. It is less suitable for a large cold garage or for buyers who want a tank big enough to run for a full day unattended.