Mountman 5.5-Gallon Cool Mist Humidifier

The Mountman cool mist humidifier is listed with a 5.5-gallon tank, a claimed coverage area of up to 3,000 square feet, and remote and touch controls. Its large stated output and selectable humidity settings suit buyers seeking broad-area humidification, while the listed 35-hour runtime is a maximum claim rather than a promise at every setting.

At a glance

Top-fill tank with a wide opening intended to make refilling and cleaning easier.
Humidistat, three mist levels and adjustable humidity settings provide options to tailor output.
Sleep mode, timer, remote control and child lock are listed for everyday operation.
A rotating nozzle and extension tube provide different mist-outlet arrangements.

Price

$149.98Save 70%

Reference price: ~~$499.99~~

Price checked: Nov 14, 2026

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Pros and cons

Pros

The stated 21-liter capacity and top-fill design may reduce how often the tank needs refilling compared with smaller units.
Remote and touch controls, a humidistat and three mist settings offer several ways to adjust operation.
The water-level window makes the remaining water visible, according to the listing.

Cons

The 25.2-inch height and roughly 10.63-inch footprint require planning for a substantial floor-standing appliance.

Technical specifications

13 specifications

Identity and capacity
Brand	Mountman
Capacity	21 liters
Color	White

Coverage and operation
Claimed floor area	3000 square_feet
Listed runtime	35 hours
Voltage	120 volts
Dimensions (D x W x H)	10.63"D x 10.63"W x 25.2"H

Controls and features
Control methods listed	Remote, Touch
Humidity adjustment	40% to 90%
Mist modes	Low, Medium, and High
Timer	12-hour timer
Noise claim	below 30 dB
Nozzle	360° rotating nozzle

What to know before buying

The listing presents 5.5 gallons and 21 liters as capacity figures, and claims 3,000-square-foot coverage, up to 2,000 mL per hour output and up to 35 hours of runtime. These performance figures are not independently verified, and runtime may depend on the selected mist level. The page does not specify a coverage-test basis. Keep mist away from wooden furniture and avoid excessive moisture exposure, as the listing warns this may cause aging or damage.

Who is it for?

A good fit for

Buyers seeking a high-capacity cool mist humidifier with remote control and multiple mist settings.
Households that want a visible water-level window, top-fill access and a timer.

Less suited to

Buyers looking for a compact tabletop humidifier.
Buyers who need independently verified coverage or runtime figures before choosing a model.

Mountman 5.5-Gallon Cool Mist Humidifier · photo 2 — Additional product photo 2

Customer reviews on Amazon

5 / 5 · 4 ratings

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The supplied rating information is uniformly five-star, but comes from only a small number of ratings and includes no written feedback. It can offer limited reassurance about buyer satisfaction, but does not establish how the claimed coverage, output or runtime perform in a particular room.

Frequently asked questions

How large an area is this humidifier claimed to cover?

The listing claims coverage of up to 3,000 square feet. It does not provide a test basis, so treat that as a manufacturer claim rather than a verified coverage result.

How long can it run on one fill?

The listed runtime is up to 35 hours. The actual duration may vary with the selected mist level, and the listing does not specify the conditions for that maximum.

Can the humidity level and mist output be adjusted?

The feature information lists humidity adjustment from 40% to 90% and three mist modes: Low, Medium, and High.

What controls and timer are listed?

The product details list remote and touch controls, sleep mode and a 12-hour timer.