Dry air with the heating on: the best humidifiers for bedrooms
The clocks go back on Sunday 25 October, and for most of us the heating is now on every evening. If you wake with a dry throat or lips, first check the bedroom's humidity with a cheap hygrometer. Aim for 40–60%. Only if it is regularly under 40% do you need a humidifier, and for a bedroom that means a quiet cool-mist unit with a 3–6 litre tank and an auto mode that stops at your target. Many UK homes are damp rather than dry, and for those a humidifier makes things worse.
Meaco Deluxe 202 Ultrasonic Humidifier and HEPA Air Purifier White
Photographed listing — tagged buy buttons go to the retailer, not another article.
Humidifiers
Our picks, and why
Ranked on price, real demand, brand and seller. Brands cannot pay to change this order. How we pick
- #1Best overall£99.99
Meaco Deluxe 202 Ultrasonic Humidifier and HEPA Air Purifier WhiteOur top-ranked unit in stock now. Meaco, an established brand. Sold through Amazon UK.
- Value
- 1 out of 10. £50 over the typical £50
- Brand trust
- 10 out of 10. Meaco, an established brand
- Seller trust
- 10 out of 10. Sold through Amazon UK
Same price for 30 days
- #2Best value£39.99
Dreo Humidifier for Bedroom with Sensor, 26dB Quiet Cool Mist Ultrasonic Humidifiers for Home, 360° Nozzle, 30H Runtime, Ambient Light Indicator, Essential Oil Diffuser, Room, Plants, Nursery, BlackThe cheapest established brand at or under the typical price (£10 under the typical £50).
- Value
- 7 out of 10. £10 under the typical £50
- Brand trust
- 10 out of 10. Dreo, an established brand
- Seller trust
- 10 out of 10. Sold through Amazon UK
£6.61 above its 30-day low
More bedroom humidifiers in stock now
In the order our ranking puts them, the same ranking as the humidifiers page. We show at most 2 models per brand. Tank size, mist type and the noise figure are what each listing states; we have not tested these units.
- DREO 6L Smart Humidifier for Bedroom, 28dB Quiet, 60H Runtime, Cool & Warm Mist, Top Fill with 360° Rotating Nozzle, Humidity Sensor, Baby, Indicator Light, Essential Oil Tray, App, Alexa & GoogleDreo · 6L tank · Warm and cool mist · Listed at 28dB£99.99
- DREO Smart Humidifiers for Bedroom, 6L Top Fill Supersized Cool Mist Humidifier for Large Room, 60 Hour Runtime, Quiet Ultrasonic Humidifier for Plants, Indoor, Home, Night Light, BlackDreo · 6L tank · Cool mist£67.98
- Levoit Smart Warm & Cool Mist Humidifier, 6L Top Fill, TimerLevoit · 6L tank · Warm and cool mist£88.99
- Levoit Smart Warm & Cool Mist Humidifier, Top Fill, Voice ControlLevoit · Warm and cool mist£84.99
- Homvana Cool Mist Humidifier for Bedroom, Baby, Room, Home (3.6L, Grey)Homvana · 3.6L tank · Cool mist£39.99
Levoit is a commission partner and sent us review units free of charge. That does not change the order of this list or the picks above, which come from the same data for every brand.
We earn a commission if you buy through links on this page, at no extra cost to you. As an eBay Partner Network affiliate and an Amazon Associate, we earn from qualifying purchases. Links we earn from are marked “affiliate link”. Used and refurbished eBay listings are labelled as such. Full disclosure.
Why the heating dries the air
Heating does not take water out of the air. It lowers the relative humidity, because warm air can hold more moisture than cold air. Winter air outside holds very little. Air at 5°C and 80% humidity, warmed to 20°C, falls to about 30%. That is why a bedroom can feel dry on a cold, clear night with the radiators on.
The other side: showers, cooking, drying washing and simply breathing put moisture back. In many UK homes, especially older or less ventilated ones, the problem in winter is condensation, not dry air. If your windows are wet most mornings or you see dark spots in corners, skip the humidifier. Read our dehumidifiers for damp homes guide instead.
Measure first: the hygrometer tip
- A digital thermometer-hygrometer is inexpensive and tells you whether you need a humidifier at all.
- Put it near the bed at head height, away from the window, radiator and (later) the humidifier itself.
- Read it for a few days, morning and evening. One reading on a cold night is not enough.
- Under 40% most of the time: a humidifier helps. 40–60%: you are fine. Over 60%: you need less moisture, not more.
- Cheap hygrometers can be a few percent out. Watch the trend, not the exact number.
Cool mist or warm mist?
| Type | Good | Watch out for | A night |
|---|---|---|---|
| Ultrasonic (cool mist) | Quiet, cheap to run, no hot water. Most bedroom models. | White dust with hard water. Clean the tank often. | 5.9p |
| Evaporative (wick) | Hard to over-humidify; no white dust. | Fan noise; wick filters to replace. | 5.9p |
| Warm mist | Boils the water; no white dust. | Several times the power. Hot outlet: keep away from children and pets. | 49p |
8 hours at 24.5p/kWh (Oct 2026 price cap), assuming about 30W for cool mist and 250W for warm mist with the heater on. Your unit's rated power is on its listing.
Look at the kit — then buy it
DREO Smart Humidifiers for Bedroom, 6L Top Fill Supersized Cool Mist Humidifier for Large Room, 60 Hour Runtime, Quiet Ultrasonic Humidifier for Plants, Indoor, Home, Night Light, Black
Levoit Smart Warm & Cool Mist Humidifier, Top Fill, Voice Control
We earn a commission if you buy through links on this page, at no extra cost to you. As an eBay Partner Network affiliate and an Amazon Associate, we earn from qualifying purchases. Links we earn from are marked “affiliate link”. Used and refurbished eBay listings are labelled as such. Full disclosure.
What to look for in a bedroom humidifier
- Tank size against a night's running
- Makers quote run time on the lowest setting. To check a unit lasts the night on the setting you will use, divide the tank by the mist output: 3 litres at 300ml an hour is 10 hours. For a bedroom, 3–6 litres is usually enough for a night without refilling; bigger tanks are heavier to carry to the tap.
- An auto mode (humidistat)
- The most useful feature. Set it to 45–50% and the unit stops when the room gets there, so you do not wake to wet windows.
- Noise and light
- Decibel figures in listing titles are the maker's own, usually on the lowest setting. We have not measured them. A sleep mode that turns the display off can matter as much as the hum.
- Easy to clean
- A top-fill tank with a wide opening is easier to wipe out than a narrow bottle. Standing water grows bacteria and mould, so this is not optional.
Cleaning and limescale
- Empty the tank each morning, rinse it and let it dry. Do not top up old water.
- Once a week, descale the tank and base as the manual says, usually with white vinegar or citric acid, then rinse well.
- Much of England, especially the south and east, has hard water. In an ultrasonic unit that means white dust and faster scale. Filtered or distilled water, or the maker's demineralisation cartridge, cuts both.
- Replace filters or wicks when the manual says. A clogged wick just stops working.
Where to put it
On a flat, raised surface such as a chest of drawers, about a metre from the bed, with the mist pointed into the room rather than at a wall, curtains or electronics. Dry air can leave your nose, throat, lips and skin feeling dry, especially when you wake, and the right humidity can make a bedroom more comfortable. A humidifier is not a treatment for any condition. If you have asthma or another breathing condition, ask your GP or pharmacist first.
AdLevoit partner picks — in stock now
Levoit pays us a commission on sales from these links and sent us review units free of charge. Their placement here is paid; it does not change our rankings or the full list below. Full disclosure.
FAQ
Humidifiers and dry bedrooms: common questions
- What humidity should a bedroom be in winter?
- Roughly 40–60% relative humidity. Below about 40% the air can feel dry on your skin, lips and throat. Above 60% for long spells, UK homes start to get condensation on cold windows and walls, and mould follows. Around 45–50% is a sensible target for a bedroom.
- Does central heating dry the air?
- Heating does not remove water, but it lowers relative humidity. Cold outdoor air holds little moisture. Air at 5°C and 80% humidity, warmed to 20°C indoors, drops to about 30%. Cooking, showers, drying washing and breathing add moisture back, which is why many UK homes are damp rather than dry. Measure before you buy.
- Is it OK to run a humidifier all night?
- Yes, if it has a humidistat (auto mode) set to around 45–50%, so it switches off when the room reaches the target. Without one, it keeps adding moisture all night and can push a small, closed bedroom into condensation by morning.
- Cool mist or warm mist for a bedroom?
- Cool mist (ultrasonic or evaporative) is cheaper to run and has no hot water, which matters with children or pets in the room. Warm mist boils the water, so it leaves no white dust from hard water, but it uses several times the electricity and the tank and outlet get hot.
- Can a humidifier cause damp or mould?
- Yes, if it pushes the room above about 60% for long periods. Signs are wet windows in the morning and dark spots in corners. If you already see those, the room needs a dehumidifier, not a humidifier.
- Why is there white dust around my humidifier?
- Ultrasonic humidifiers turn the minerals in hard tap water into a fine white dust that settles on furniture. Use filtered or distilled water, or a demineralisation cartridge if your model takes one. Warm-mist and evaporative types do not do this.