How long does the tank last?

Up to 36 hours on the low setting, roughly 16 hours on medium and about 16 hours on high at 250ml/h. Most owners refill every one to two days on high.

Does it have auto mode or a humidity sensor?

No. You pick one of three mist levels and set the 1-7 hour timer yourself. There is no hygrometer and no auto shutoff based on room humidity.

Is it quiet enough for a bedroom?

Yes. DREO rates it at 28dB, and owners describe it as whisper-quiet on low. Higher settings add some water sound.

Remove the lid and lift out the tank. The wide top opening lets you wipe and descale the inside without narrow spots. Rinse the tank weekly and descale monthly.

Does the mist wet floors or furniture?

The ultrasonic mist is fine and rises up to 40 inches, so it disperses before settling. Owners report no damp surfaces when used at normal settings.

Does it work with an app or smart assistant?

No. Controls are on the unit itself: power, three mist levels, the light and the timer. There is no Wi-Fi or app.

Where is the DREO 4L Cool Mist Humidifier for Large Room cheapest?

At Walmart, for $36.09, as of our latest check.

What do buyers say about the DREO 4L Cool Mist Humidifier for Large Room?

Rated 4.6 out of 5 from 4,025 ratings.

DREO 4L Cool Mist Humidifier for Large Room

Best price now

$36.09at WalmartChecked Nov 12

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Walmart

DREO 4L Cool Mist Humidifier for Large Room

Best price now

$36.09at WalmartChecked Nov 12

Compared across 2 stores. Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $36.09 at Walmart on Nov 12.
Checked at 2 stores.

Our take on the DREO 4L Cool Mist Humidifier for Large Room

The DREO 4L is a top-fill ultrasonic cool mist humidifier for large rooms. Its 4-liter tank runs up to 36 hours on low, and the mist rises up to 40 inches so it spreads across a room without wetting floors or furniture. It runs at a claimed 28dB with three output levels and a 1-7 hour timer. Against rivals, it trades smart-app control and a humidity sensor for a big tank, quiet operation and easy cleaning, which is what most owners praise.

Best forBedrooms and nurseries where quiet mattersLarge rooms that dry out overnightPeople who want top-fill refills and simple cleaningBuyers who prefer dials over app control

Pros

4L tank gives long runs between refills
Top-fill lid and detachable tank make cleaning easy
Very quiet at 28dB on low
Three mist levels plus a 1-7 hour timer
Fine mist that does not soak surfaces

Cons

No humidity sensor or auto mode
No app or smart-home control
Blue night light cannot be dimmed separately
Mist output drops as the tank empties

DREO 4L Cool Mist Humidifier for Large Room prices at every store

WalmartNew
In stockSold by DREOReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$36.09Checked Nov 12
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WalmartNew
In stock
$52.82Free shippingChecked Nov 12
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DREO 4L Cool Mist Humidifier for Large Room price history

Lowest price we've seen: $52.82 on Nov 12 at Walmart. Tracked across 1 store since Nov 12.

What reviewers say

4.6 / 54,025 ratings

Owners rate it highly, mostly for quiet operation, long runtime and easy refilling. Complaints center on the lack of auto humidity control and the bright blue light.

What people mention

NoisePraisedOwners say it is quiet enough to sleep beside on the low setting.
RuntimePraisedThe 4L tank is reported to last several nights on low before a refill.
CleaningPraisedThe removable lid and detachable tank make rinsing and descaling easy.
Humidity controlCriticisedReviewers miss a humidity sensor and auto mode; output is set manually in three steps.
Night lightMixedThe blue light is liked for nighttime use but called too bright by some.
Mist outputMixedMist is fine and does not wet surfaces, but output tapers as the tank drains.

About the DREO 4L Cool Mist Humidifier for Large Room

The DREO 4L Cool Mist Humidifier uses ultrasonic technology to produce an ultra-fine cool mist with particles as small as 5 microns. The mist rises up to 40 inches and spreads through the room without wetting surfaces. The 4L tank runs for up to 36 hours.

It has three humidity levels and a 1 to 7 hour timer. At 28dB it runs quietly, and it has a blue light. The lid comes off in one step, so you can refill from the top without moving the unit. The tank is fully detachable for cleaning.

A built-in aroma pad tray holds a refillable pad, so you can add your own essential oil. One replacement aromatherapy pad is included.

Capacity: 4 L water tank
Runtime: Up to 36 hours
Mist type: Ultrasonic cool mist, 5 micron particles
Mist height: Up to 40 inches
Noise level: 28dB
Humidity levels: Low 120 ml/h, medium 180 ml/h, high 250 ml/h
Timer: 1 to 7 hours, adjustable
Refilling: Top-fill with one-step lid removal
Cleaning: Fully detachable tank
Aromatherapy: Built-in aroma pad tray with refillable pad
Light: Blue light
Color: White
In the box: Humidifier, 1 replacement aromatherapy pad

Specifications

actual_color: WhiteSource
color: WhiteSource
size: 4 LSource

Questions and answers

How long does the tank last?: Up to 36 hours on the low setting, roughly 16 hours on medium and about 16 hours on high at 250ml/h. Most owners refill every one to two days on high.
Does it have auto mode or a humidity sensor?: No. You pick one of three mist levels and set the 1-7 hour timer yourself. There is no hygrometer and no auto shutoff based on room humidity.
Is it quiet enough for a bedroom?: Yes. DREO rates it at 28dB, and owners describe it as whisper-quiet on low. Higher settings add some water sound.
How do I clean it?: Remove the lid and lift out the tank. The wide top opening lets you wipe and descale the inside without narrow spots. Rinse the tank weekly and descale monthly.
Does the mist wet floors or furniture?: The ultrasonic mist is fine and rises up to 40 inches, so it disperses before settling. Owners report no damp surfaces when used at normal settings.
Does it work with an app or smart assistant?: No. Controls are on the unit itself: power, three mist levels, the light and the timer. There is no Wi-Fi or app.
Where is the DREO 4L Cool Mist Humidifier for Large Room cheapest?: At Walmart, for $36.09, as of our latest check.
What do buyers say about the DREO 4L Cool Mist Humidifier for Large Room?: Rated 4.6 out of 5 from 4,025 ratings.