Dehumidifiers
The right answer depends entirely on the room, the temperature and how often you'd run it. Pick the scenario closest to yours.
The scenario the tool was made for
The single job it does better than any alternative.
A small refrigerant unit in a closed utility room dries a load for roughly a third of the cost of a tumble dryer, and the extracted water leaves the house rather than ending up on the bedroom windows.
Windows stream, laundry never dries, or one room feels persistently damp.
Bathroom and kitchen extract fans, actually run for long enough after showers and cooking, remove most of the moisture a UK home makes each day. Confirming they work and are humidistat-triggered is the first check.
If daily dehumidifier running is the pattern, PIV at around £700 fitted runs at a handful of watts and stops the humidity ever climbing high enough to need extraction. The running-cost maths usually flips inside two winters.
If you've considered these and a dehumidifier is still the right answer for your home, here's how to choose well.
For indoor laundry, one damp room or an unheated outbuilding, a dehumidifier is the correct tool; refrigerant for heated rooms, desiccant for cold ones. Set the humidistat and let it cycle rather than running on maximum.
The decision, in six questions
Six questions decide whether a dehumidifier is the right tool for your problem, a useful stopgap, or a distraction from the real fix.
Do you dry laundry indoors regularly with no tumble dryer and no drying garden?
A small refrigerant dehumidifier in a closed room is the honest best answer; cheaper than a tumble dryer and the moisture leaves the house.
Strong candidate
Laundry drying is the single strongest case for a dehumidifier; without it, the case has to stand on other ground.
Worth considering
Is the problem confined to one specific room (cellar, garage, damp bedroom, room after a leak)?
A dehumidifier fits one room well; that is the job it does.
Strong candidate
Whole-house humidity across every winter is a ventilation problem, not a humidity one. Fix that first; a dehumidifier is a rental tool, not a permanent fitting.
Probably not for your home
Is the affected room heated to normal room temperature (17°C or above) most of the time?
A refrigerant unit will work efficiently; buy refrigerant.
Strong candidate
Refrigerant loses performance below 15°C; for a cold cellar, garage, holiday home or unheated bedroom, buy desiccant.
Strong candidate
Are you running (or planning to run) the dehumidifier daily through winter?
Daily use is a signal the ventilation is undersized. PIV or upgraded extract fans will cost less than the dehumidifier's electricity within eighteen months.
Worth considering
Seasonal or task-based use is exactly what the tool is for; run it for the job, put it away afterwards.
Strong candidate
Is there visible mould growth on walls or ceilings you cannot explain by a single cold surface?
The house has a chronic ventilation and surface-temperature problem; extraction alone will not resolve it. Look at PIV and at insulating the cold surface.
Probably not for your home
The dehumidifier is doing manageable work; the underlying fabric is not fighting you.
Strong candidate
Is the room you want to treat under 25m² and can you close its door?
The unit will do useful work; contained rooms are where dehumidifiers shine.
Strong candidate
Trying to dehumidify a large open-plan space is a losing job; a bigger unit does not resolve it. Fix the ventilation and shut the door.
Probably not for your home
What usually changes the answer
Change one of these and our recommendation often changes with it.
You already have PIV or MVHR running.
What changes
You live in a top-floor flat with no viable ventilation upgrade and single-glazed windows that stream every morning.
What changes
The affected room is unheated or below 15°C for long stretches.
What changes
You are drying laundry indoors and considering a tumble dryer.
What changes
The house has active damp from a structural cause (rising damp, penetrating damp, a leaking gutter).
What changes
You are a renter and cannot install PIV or upgrade extract fans.
What changes
If this were our house
For a UK semi with a utility room, indoor laundry drying and streaming bedroom windows every January
We would buy one small refrigerant dehumidifier (twelve to sixteen litres a day rated capacity) and dedicate it to the utility room. Door shut, run for four to six hours whenever washing is drying. That single change usually removes the bedroom-window streaming problem, because indoor laundry is typically responsible for a surprising share of a home's winter humidity.
Alongside that, we would treat the streaming windows as a ventilation problem and price a PIV unit at around seven hundred pounds fitted. PIV runs continuously at a handful of watts and stops the humidity building up in the first place; the dehumidifier then does only the laundry job and lives in a cupboard the rest of the time. If PIV was not viable (top- floor flat, no loft access) we would upgrade the bathroom and kitchen extract fans to properly-sized humidistat models, and only then judge whether the dehumidifier still had daily work to do.
When we'd say no
We would rather lose the sale than take you somewhere the numbers don't stand up.
You are running a dehumidifier every day of the year to keep the house liveable. That is a ventilation problem the dehumidifier is only masking; the running cost will outpace a proper fix within eighteen months.
You are considering a large industrial unit (35 to 50 litres a day) for a normal domestic home. Sizes above 25 litres a day are for construction drying and post-flood restoration; a home does not need that capacity and running one there is expensive theatre.
The damp is coming from a structural cause (rising damp, a leaking gutter, penetrating damp on an exposed wall). A dehumidifier will lower the room's relative humidity while the fabric behind the plaster keeps getting wetter; the wall needs the survey, not the extraction.
You are being sold a dehumidifier as a permanent alternative to installing PIV or fixing the bathroom extract fan. The running-cost maths does not work; the fan or PIV wins on cost within two winters in almost every case.
The room is unheated and you are being sold a refrigerant unit. Refrigerant units lose most of their extraction below 15°C; a desiccant unit is the right tool and the retailer either knows and is hoping you do not, or does not know at all.
What most people get wrong
The trade at a glance
A five-step editorial scale, not a rating. Green weight is a gain; grey weight is a cost you carry.
Up-front cost
£140 to £240 for a compact 12L/day refrigerant, £200 to £380 for a mid-size 20L/day, £190 to £350 for a desiccant.
Extraction effectiveness in a heated room
Refrigerant units pull eight to twelve litres a day in real UK conditions; enough to resolve one damp room or a laundry load.
Extraction effectiveness in a cold room
Below 15°C refrigerant extraction collapses to almost nothing; desiccant is the honest tool for cellars, garages and unheated rooms, and does the same job at medium level in the cold.
Running cost per day
A 20L/day refrigerant unit at eight hours a day is 60p to £1 at 2026 UK tariffs. Desiccant is roughly double.
Noise
Refrigerant units sit at 40 to 50 dB on medium; audible but not intrusive. Cheap desiccant units are louder because of the internal heater and fan.
Install complexity
Plug in, empty the tank or run a drain hose. No installer, no wiring, no professional certification.
Lifespan
Five to eight years in typical seasonal use; less if run flat out year-round. Compressor is usually the failure point.
What it costs
One room, occasional use. Meaco, EcoAir, Pro Breeze; barely audible on eco.
The UK best-seller size; suits a 2-bed flat or one damp area in a 3-bed terrace.
Meaco Arete, Ebac, Ebac 3900; genuinely quiet at night and better humidistat control.
Meaco DD8L Zambezi, Ebac Amazon; the right tool for cellars, garages, holiday homes, unheated rooms.
Laundry drying or one damp room for six months of the year at 2026 UK tariffs.
A signal the ventilation is undersized; PIV or extract upgrades will overtake on total cost inside two winters.
Runs continuously at 3 to 5 watts; roughly £8 to £12 a year in electricity. Where PIV is viable, the running-cost maths flips inside two years.
Ranges triangulated from Meaco, EcoAir, Ebac, Pro Breeze and Dimplex UK retail pricing at 2026, Which? extraction tests, Energy Saving Trust running-cost figures and NICE guidance on damp-related indoor humidity. Refreshed each autumn before the season.
You've got the answer
For a specific job (indoor laundry, one damp room, an unheated outbuilding, post-leak drying) a right-sized dehumidifier is the correct tool; buy refrigerant for heated rooms and desiccant for cold ones, and set a humidistat rather than running on maximum. For a house that needs one running every day of the year, the answer is the ventilation, not more extraction.
You can stop here if you're still deciding. The rest of this page is for readers who have already committed and want to spend the money well.
If you're going ahead
This half of the page is written for the reader who has decided. It reads in the order the decisions come at you.
Which version
Warm moist air passes over a cold coil; water condenses into a tank. Efficient above 15°C, extraction collapses below it. The default UK domestic tool and the right one for heated rooms, laundry drying and summer damp.
When we'd choose it
Any room that is normally heated to 17°C or above; the bulk of domestic use cases.
A rotating zeolite wheel adsorbs moisture, with a small internal heater regenerating it. Works down to 1°C with almost no drop in extraction; uses more electricity per litre at normal room temperatures.
When we'd choose it
Cellars, garages, integral garages, holiday homes, unheated bedrooms and any room below 15°C for long stretches. The wrong choice for a heated main room; overkill and more expensive to run.
Designed for construction drying and flood restoration. Big compressor, loud fan, high electricity draw. Occasionally rented for a week after a leak.
When we'd choose it
Post-flood or building-out work only. Never as a permanent domestic fitting; the size is wrong for the house.
Thermoelectric-cooler units that extract 0.3 to 0.5 litres a day. Silent, but the extraction rate is a rounding error compared to a proper refrigerant unit.
When we'd choose it
Enclosed cupboards, small wardrobes, boats; nowhere a real dehumidifier would fit. Not a replacement for the primary tool.
Your house
A dehumidifier works on the air in the room it is in. Open the door to the rest of the house and the unit is trying to dry the whole floor through a doorway; extraction collapses and running cost climbs. Close the door and the same unit resolves the same problem in a fraction of the time.
For laundry drying specifically, the closed-door discipline is the entire trick. Four hours in a closed utility room; the clothes are dry, the water is in the tank, the rest of the house is unaffected.
Mould grows on cold surfaces, not in the middle of a warm room. A dehumidifier lowers the average room humidity but the corner behind the wardrobe or the cold spot on a solid wall is still condensing. Address the cold surface (curtains open at night, furniture pulled off external walls, a proper insulated lining) alongside the extraction; neither on its own finishes the job.
A dehumidifier releases the heat of vapourisation into the room as it works; a decent refrigerant unit adds roughly 200 to 300 watts of gentle heat. Useful in a cool utility room; unwelcome in a bedroom on a warm night.
Alongside PIV or MVHR the dehumidifier's job shrinks to task work (laundry, a specific damp room). The two do not fight each other; the ventilation stops the humidity building up, the dehumidifier handles the residual spike from a specific source.
A tank needs emptying every day or two in normal use; miss it and the unit shuts off and stops working. Every serious unit takes a continuous drain hose (usually to a nearby sink, condensate pump or drain); running one is the easiest change most owners never make. If the unit is doing daily work, run the hose.
In use
No UK home ever sees those conditions. In a real room at 18°C and 60% humidity, extraction is roughly half the box figure. Size to the real conditions; a 12L/day unit is often the right choice for a room that a spec-sheet reader would insist needs 20L/day.
Set the target and let the unit cycle. Running the compressor continuously to hit 30% is expensive, uncomfortable and hard on the unit; 55 to 60% is a comfortable target that avoids condensation without over-drying furniture and skin.
Cheap refrigerant units frost the evaporator coil below 12°C and stop working; the auto-defrost cycle on a better unit reverses briefly to clear the coil. If the room is anywhere near the 15°C threshold, insist on a unit with a proper auto-defrost; without it, the unit spends most of the winter frozen.
Common mistakes
Wrong technology for the room (refrigerant in a cold cellar, or desiccant in a warm bedroom); the unit works, just not as well as the other type would have.
Under-sized unit for the humidity source (a 12L/day unit trying to dry three loads of washing a day); the humidistat never satisfies and running cost climbs.
Doors left open; the unit tries to dry the whole floor through a doorway and disappoints.
Tank never emptied and continuous drain never fitted; the unit shuts off and the owner assumes it's broken.
Filter not cleaned; airflow drops, extraction drops, electricity draw climbs. Two-minute monthly job most owners skip.
Bought as a permanent solution to a ventilation problem; running cost outstrips PIV or extract-fan install within eighteen months of daily use.
Left running in an already-dry room; nothing measurable is extracted and the electricity is wasted. Humidistat off is expensive.
Choosing well
There is no installer for a domestic dehumidifier, but the buy is not trivial. Most disappointment comes from three or four questions asked (or not asked) before the click.
Maintenance
Clean the intake filter every four to six weeks in the running season; a clogged filter is the single biggest cause of extraction dropping mid-winter. Empty the tank daily or fit a continuous drain hose for heavy use. At the end of the season, wipe the coil (refrigerant) or check the desiccant wheel for dust (desiccant), empty the tank fully, run the unit for an hour to dry the internals, and store somewhere dry. Ten minutes a month in the running season and half an hour at the end of it will keep a decent unit running for six to eight years.
Real questions
A right-sized dehumidifier is a proper tool for specific jobs (laundry drying, one damp room, an unheated outbuilding, post-leak drying); it is not a permanent alternative to fixing the ventilation. Buy refrigerant for heated rooms and desiccant for cold ones; set a humidistat at 55 to 60% rather than running on maximum. If the unit is doing daily work every winter, price PIV alongside; the running-cost maths usually flips inside two years.
The permanent ventilation fix that usually overtakes daily dehumidifier running on cost.
The comprehensive whole-house ventilation option, usually for retrofits and new builds.
Where a dehumidifier fits in the wider air-quality answer for a UK home.
Cold surfaces cause local condensation the dehumidifier cannot reach.