The Best Dehumidifiers for Damp and Condensation in the UK (2026)

For normally heated living spaces, a compressor dehumidifier is the more efficient choice and usually cheaper to run per litre of water removed. If you are treating a cold, unheated space such as a garage, conservatory or utility room, a desiccant model like the EcoAir DD1 keeps working effectively at low temperatures where a compressor's performance drops off. As a rule of thumb, choose a compressor for rooms you heat and a desiccant for rooms that stay below about 15C.

The litre rating is the maximum daily extraction under warm, humid test conditions, not what you will collect every day at home. As a rough guide, a 10-12L unit suits a flat or one- to two-bedroom home, a 20-25L unit suits a typical family house, and a 30L or larger unit is for severe damp, larger properties or drying out a building. When in doubt, size up slightly, as a bigger unit reaches the target humidity faster and then idles rather than running flat out.

Modern compressor models are fairly cheap to run, especially on an auto-humidity setting so they only work when needed rather than around the clock. As an indicative example, a compressor drawing roughly 200W run for four hours uses about 0.8 kWh, which at a typical 2026 unit rate of around 25-27p per kWh is roughly 20p. Desiccant units draw more (often 300-600W) so cost more per hour, but earn their keep in cold rooms where a compressor would be inefficient. Look for an adjustable humidistat and a timer, and treat any manufacturer 'pence per hour' figure as indicative rather than guaranteed.

A dehumidifier is very effective at controlling the excess moisture that causes surface condensation and mould, and running one over autumn and winter makes a clear difference. It is a moisture-control tool, though, not a cure for structural problems: if you have penetrating or rising damp, or a plumbing leak, address the underlying cause and improve ventilation alongside using the dehumidifier. Aim to keep relative humidity around 50-55%, below the roughly 60%-plus level at which mould thrives.

Place it centrally in the dampest area with a few inches of clearance around the air inlet and outlet for good airflow. To treat the whole home, position it in a hallway or landing with internal doors open so drier air circulates; to target one room or dry laundry fast, close the door and use the laundry mode. Set an auto-humidity target of about 50-55% rather than running it constantly, and keep it off cold external walls. Emptying the tank daily is fine, or fit the continuous-drain hose to a nearby sink or drain for hands-off running.

Yes. All of our picks have auto shut-off when the tank is full and a humidistat that pauses the compressor once the target is reached, so they are designed for unattended running. For overnight use, choose a quiet compressor model such as the Meaco Arete range and use night mode. If you want to run it for long stretches without emptying the tank, connect the continuous-drainage hose so it empties itself. As with any appliance, plug it directly into a wall socket rather than a daisy-chained extension lead.