If a room is occasionally damp, start by monitoring humidity with a hygrometer. Then choose a dehumidifier for occasional use based on the size of the space, the noise level you can tolerate and how you’ll empty the collected water. Continuous drainage is only useful if you can install the hose correctly. A dehumidifier is no substitute for effective ventilation or for finding the cause of persistent damp.
Do you get condensation after a shower, cooking or drying clothes? A portable appliance could help as an additional measure, while you continue to air the room and maintain ventilation. ADEME recommends airing the bathroom after a shower, for example.
In a bedroom or a room you spend time in, compare the stated noise level and the mode it applies to, rather than choosing solely by the advertised capacity in litres per day.
For regular use, check the tank capacity. If you’re considering continuous drainage, you’ll also need a compatible appliance and a practical route for the hose to the drain.
First, check whether the damp is occasional or persistent. Then compare appliances for the room you’ll actually be treating. A hygrometer helps you monitor humidity, while a dehumidifier collects water, so you’ll need to manage the tank or hose.
| Consideration | What to check | What consumers are looking for |
|---|---|---|
| Damp and its cause | Monitor relative humidity with a hygrometer and see whether marks or condensation keep coming back. Keep the ventilation running. | If the marks keep coming back, I want to know whether an additional appliance will be enough or whether there’s a problem with the property that needs investigating; around 33 % of consumers put this check first. |
| Room size | Measure the space you’ll be treating and compare it with the area or volume stated for the exact model. Check the conditions associated with its capacity in L/day. | For an open-plan room or one used for drying clothes, I’m looking for an appliance suited to the space; this is the priority for around 25 % of consumers. |
| Noise | Compare the stated dB(A) for the mode you plan to use and think about where you’ll place the appliance. | In a bedroom or a room where I work, I don’t want the appliance to disturb me; around 25 % of consumers prioritise this. |
| Water and extended use | Check the tank capacity, whether drainage will work with your setup and the stated power rating to estimate energy use based on how long you’ll run it. | If damp is a regular issue, I want to avoid emptying the tank too often without choosing a hose that’s impossible to install; around 17 % of consumers make this their main requirement. |
Collecting water in a room is no substitute for renewing the air. ADEME advises never switching off the mechanical ventilation system (MVHR) or blocking air inlets and extractor vents.
Keep the ventilation running and use the dehumidifier only as an additional measure.
The amount of water extracted depends on factors including temperature, the initial humidity level and the room, as De’Longhi points out. So the advertised capacity alone doesn’t tell you how the appliance will perform in your home.
Compare the recommended area or volume for the exact model and the conditions associated with its rated capacity.
De’Longhi says the continuous-drainage hose must not run upwards or become kinked. In this setup, water may continue to collect in the tank.
Before choosing this feature, check the instructions, the drain location and whether the hose can be routed suitably.
An appliance for occasional use won’t fix a leak or another problem with the property. Qualitel recommends getting a diagnosis if the damp persists.
If the marks return, spread or are accompanied by damaged materials, get the cause investigated rather than relying on the appliance alone.
The range includes electric compressor dehumidifiers, including the Extrême Dry Compact+.
The brand offers compact models, as well as models rated at 20 or 25 L/day for larger spaces.
The Tasciugo range includes dehumidifiers for home use, including models designed to help with drying clothes.
These electric appliances have a tank and continuous drainage. They’re suitable for damp rooms where a hose can be routed appropriately, but you don’t have to use them in this way. Compare the stated room size, how the collected water is managed and the noise information that matters for your needs.
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Worth considering for a room that matches the stated area, if continuous drainage can be installed.
The title states up to 40 m², a 2.5 L tank and three modes: automatic, drying and sleep. Check your room’s volume and the noise level for the mode you plan to use.
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Worth considering for a room close to the stated area, bearing in mind you’ll need to empty the tank if drainage isn’t an option.
The title mentions a 25 m² room, a 24-hour timer and automatic shut-off. If you’ll be running the appliance near a place where you sleep, check the noise level for the mode you choose.
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The tank and hose give you two ways to manage collected water, depending on whether you can install drainage in the room.
The title states four modes and coverage of up to 32 m². Compare this with the actual volume of your room and check the noise level if you’ll be spending time there.
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Worth considering if you’d like a timer and can connect the continuous-drainage hose, particularly if you plan to use it to help dry clothes.
The model description states coverage of up to 32 m², a 24-hour timer and a laundry-drying mode. Check that it’s suitable for your room’s volume and check the noise level before using it in an occupied space.
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Worth considering for a room that matches the stated area, with the option of using the tank or continuous drainage if your setup allows it.
The title states up to 24 m², a 1.8 L tank and three modes: automatic, drying and sleep. Check your room’s volume and the noise level for the mode you’ll use.
No. A dehumidifier for occasional use collects water in a room, but it doesn’t replace ventilation. ADEME advises never switching off the mechanical ventilation system (MVHR) or blocking air inlets or extractor vents. You should also continue to air the room after activities that produce moisture.
Qualitel generally recommends a relative humidity range of between 40 % and 60 %. Measure the level in the room with a hygrometer and monitor how it changes before deciding how to use a dehumidifier.
If the damp persists or marks and damage keep returning, get the cause investigated: a dehumidifier for occasional use won’t repair the property. Qualitel lists poor ventilation and water ingress among the possible causes, and recommends getting a professional diagnosis if the problem persists.
Multiply the appliance’s power rating in kW by its running time in hours to calculate energy use in kWh, as Rowenta explains. Factor in how long you’ll actually use it and any automatic cycles. The stated capacity in L/day alone isn’t enough to work out energy use.