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H920BL Ultrasonic Cool Mist Humidifier by PureGuardian® H920BL Ultrasonic Cool Mist Humidifier by PureGuardian®
4.45 5 16

H920BL Ultrasonic Cool Mist Humidifier by PureGuardian®

Availability: In stock - USA and Canada SKU: H920BL
MSRP: $39.99
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Product Information

The 10-hour* Ultrasonic Cool Mist Humidifier guards against problems caused by dry air in the home. Cleanliness matters!  Unlike other humidifiers that grow slimy mold on the water tank surface, Silver Clean™ Protection is embedded in the tank to fight the growth of mold and mildew on the surface of the water tank.

Thanks to ultrasonic technology, it disperses a soothing, cool mist into the air and is ultra-quiet making it ideal to have on while you sleep. It is great for tabletops due to its compact size.

A low water indicator light lets you know when it’s time to refill the water tank and the night light feature makes it a great addition to kids’ rooms!  PureGuardian® humidifiers create a better home environment for those suffering from colds, allergies and dry skin.

Note: Run time is based off of running the unit on low speed, also depends on atmospheric conditions. Order yours now!  

It is important to only use GENUINE Guardian Technologies™ replacement parts to maintain product performance.

Ideal For

  • Small rooms


Mold and Mildew Resistant Tank
Silver Clean™ Technology: The water tank has been treated with a fungistatic agent to protect it from fungal and mold growth.

Cool Mist Humidification
Optimize comfort with soothing low and high cool mist settings.

No Added Costs
No evaporating pads, filters or wicks to clean or replace.

Ultra-Quiet Operation
Ultrasonic technology is ultra-quiet when running making it easy to have on while you sleep.

Space-Saving Design
Compact design is perfect for your nursery or desktop and features an optional night light.

Low Water Indicator
Lets you know when it’s time to refill the water tank.

Additional Features:

  • Up to 10-hour run time*
  • .21 gallon tank capacity
  • 11-inches tall
  • Directional Mist Nozzle
  • Auto Shut-Off
  • Low water indicator illuminates when it's time to refill the tank

Product Specifications

  • SKU: H920BL
  • Weight: 1.1lbs.
  • Dimensions: 4.72 x 4.72 x 10.8
  • Cord Length: 5'
  • Construction: Plastic
  • Run Time: Up to 10 hours
  • Manual: H920BL PDF Manual
  • The Guardian Technologies™ PureGuardian® Ultrasonic Humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets that are expelled out into the room to help maintain the desired humidity level. An ultrasonic humidifier is virtually silent when operating.

  • Why should I use a humidifier?
    People need a certain level of humidity to be comfortable. In the winter, indoor humidity can be extremely low, and the lack of humidity can dry out your skin and mucous membranes. Low humidity also makes the air feel colder than it actually is. Dry air can also dry out the wood in the walls and floors of our houses. As the drying wood shrinks, it can cause creaks in floors and cracks in drywall and plaster. Dry air also increases static electricity.

    Does the product require regular cleaning?
    It is recommended to wipe out the water tank and base of the product on a regular basis; approximately every 1–2 weeks (depending on use). The Guardian Technologies™ PureGuardian® Ultrasonic Humidifier has Silver Clean™ technology in the water tank, which helps to fight the growth of mold and mildew on the surface of the water tank.

    When storing the unit, it is recommended to pour any excess water out and clean it with a soft, damp cloth. Let dry completely before storing.

    Are there any wicks or evaporating pads to replace?
    There are no wicks or pads to replace.

    What is ultrasonic technology?
    An ultrasonic humidifier uses a metal diaphragm vibrating at an ultrasonic frequency to create water droplets. Thanks to ultrasonic technology, the Guardian Technologies™ humidifier is virtually silent when running, making it easy to have on while you sleep.

    What is Silver Clean™ technology, and why is it used in your humidifier?
    Silver Clean™ technology is small particles of silver embedded in the tank to fight the growth of mold and mildew on the surface of the water tank.

    Where should I use the product?
    It is recommended that you place the product up on a table or nightstand and not on the floor.

    What is a comfortable humidity level?
    Forty to fifty-five percent (40–55%) humidity is considered within the comfortable range. Any humidity level below thirty percent (30%) is considered dry.

    Do I need to put in a certain type of water for my humidifier to work?
    You can use either distilled or regular tap water. If you have a high mineral content in your tap water, it may be preferable to use distilled water. Since distilled water is likely to contain lower mineral content than most tap water, it will prevent less build-up.

    How long is the warranty?
    The warranty is 3-years limited. For detailed warranty specifications, please refer to the warranty section in the instruction manual.

    If you have further questions, please contact us at 1-866-603-5900

  • By completing this form, you agree to be automatically added to our marketing lists. We promise to respect your privacy. You can opt-out by clicking unsubscribe from any email you may receive from us.

    To read the full warranty, click here.

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By: Kayleigh

Just bought it and love it!

To be fair, this is my first day using it but just had to comment. As an FYI, I filled it up only ¾ of the way and it's been running at high steam setting for the last 6 hours with water to spare!! I work in a large open-concept office and was afraid that this little humidifier would not cut it but oh how it does! My face broke out pretty badly as soon as the heat kicked in at the office (big high-rise building!); it's beyond dry in here and so I decided to buy a humidifier. Again, it's been one day, but what a difference it makes! My colleague just ordered one online as well. Hope this honeymoon lasts :-) So far I do not regret my purchase. Oh, and believe what you read about it being noiseless...you really cannot hear it at all except for the odd gurgle now and then.

By: Cubicle Farmer

Exactly what I had in mind

It's on the desktop of a cubicle in an extremely dry building. Soon after plugging it in, I noticed a dramatic difference in how I felt. The humidity level improved my breathing, skin, and my houseplants' health. I ordered direct from the company after seeing one on a co-worker's desk, and recommended this site to another office mate after discovering how effective it is.

By: Kayleigh

Great buy!

I work in a 3000 sq. ft open-concept office and this humidifier does the job. You can move the nozzle at the top towards the direction you desire. I keep it on my desk about 2 feet away from me. Once the heat kicks in, our office becomes beyond dry (my skin broke out, was itchy and so dry!) that I finally had to purchase a humidifier. I read many comments and did a lot of online research before purchasing it and all I can say is, one week in and no complaints whatsoever! Some people wrote that it would not produce any mist after a short while. This happened to me also, after only a few days, but I quickly realized that I needed to empty the base of the water sitting in it once the tank is removed and that's it! I wipe it dry also before putting the tank back on but not sure you have to. No leaks, nice and dry, so no mess on your desk. I get 7 hours + out of it running non-stop while at work. I do use distilled water in it based on my readings but my colleague who bought the exact same one, uses filtered water. Will see down the line how they each do with different type of water. My colleagues get a kick out of this humidifier and drop my cubicle sometimes just to get a little dose of mist :-)

By: Gill

My favourite

I shopped around and returned a few humidifiers, I found this one was the most quiet, cost-effective and simple to use. And it works. I do wish I bought the bigger one because I find my apartment in the city is just that dry.

By: Tinkerbell

Not sure I would buy product again

It doesn't last 10 hours barely last 7, and is very flimsy sitting on base

By: M. Wilson

Great Little Humidifier

We live in a dry climate, and wanted something small for our bedroom. It fits nicely on our bedside table and really does the trick. It's quiet and lasts all night. I even bought one for my parents.


Good little humidifier

Ive had my humidifier for 2 years, and it does the job of keepinga good level of humidity in our beroom. I put it on 2-3 hours before we go to bed, and it is good level bedroom, we dont have a big bedroom.


Good little humidifier

Ive had my humidifier for 2 years, and it does the job of keepinga good level of humidity in our beroom. I put it on 2-3 hours before we go to bed, and it is good level bedroom, we dont have a big bedroom.

By: Thurstod

Great little humidifier!

I've only had this humidifier for a week, but it has already surpassed my expectations after two failed attempts to get a [working] small humidifier from a local box store. It's small and cute, just perfect for my bedside table, where I need the mist the most to ward off nosebleeds and headaches caused from a warm and dry bedroom in the cold months. Just a slight touch turns it on, and the mist on the low setting is adequate enough and it lasts through the night. Easy to fill, and it is so quiet I forget that it is on (except for occasional gurgling or drips). The cost is quite reasonable, and I appreciate that the warranty lasts longer than the cheaper models from the box store. I would not hesitate to recommend this humidifier to anyone!

By: John

Nice for trips

Small enough to take on trips as most hotel rooms are very dry.

By: Desert High and Dry

Run Time

The H920 10 Hour* Ultrasonic Cool Mist Humidifier does an adequate job. Easy to fill and is pleasing to the eye. The claim that the unit runs for 10 hours on the low setting is a stretch at best. On low, the actual run time is around 8 hours. In hindsight, I should have purchased the next size up that claims to run 30 hours*

By: Jennifer

Great buy

Works great! Wish the reservoir was a little larger, but honestly it keeps the water fresher so I don't mind filling it nightly.

By: Tommy Candy Chuan

Cool looking humidifier

I bought this from target because of how dry it is during the winter and it makes my throat really dry. It lights up blue and looks really awesome at night sorta like a lava lamp. I've had it on entire night and there was still water in it when i woke up. Really cheap and nice humidifier.

By: Lisad


Very happy with product. I have a sinus condition and this works wonders
Good for a bedroom, not for larger spaces like living room

By: love-oreo

love it@

This works well and built to resist micro-organism growth.
I has cool blue light with two speed control. Also you can disconnect from the unit to dump out the remaining of water without unplugging.

I wish it has more than 10 hour while it is running at high humidity.

By: Man in the Middle "strasma"

Just the thing for bedside.

We're caring for a young friend this weekend, who arrived with a persistent cough. Sadly, our humidifier for such needs chose that moment to fail, so off I went to Target for an immediate replacement (sometimes even overnight shipping just isn't fast enough.)

Since we are getting older and starting to cut down on "stuff", I wanted something small, just to sit at bedside during an illness, as we already have a whole house humidifier on our furnace.

Of the two small choices, both quite inexpensive, this one both looked much better, and had a much simpler internal layout, which should simplify cleaning. It claims to use "Silver Clean" technology to further minimize cleaning, but comes with a small pick and brush tool, which suggests at least a bit of cleaning can be expected.

Filling was very easy. Remove and invert the blue water tank, unscrew a fill cap, fill with water, screw the cap back on, and invert the tank back into its original position.

I was pleased to see mist coming out of it within seconds of plugging it in and pressing the on button. The mist is easy to direct toward the person it is there to help, and hasn't left any water drops on the furniture yet after an hour of use. It claims to operate up to 10 hours on 0.21 gallons, presumably on low rather than on high, and in a small room. As advertised, it is almost silent in use.

Pushing the button repeatedly chooses the following settings: 1) low power light off, 2) low power light on, 3) high power light on, 4) high power light off, 5) all off.

Power is via a small 110/220 volt (50/60 cycles) wall brick that uses about 60 watts, and delivers 24 volts to the unit. That's vastly more efficient and safer than the steam humidifiers owned previously.

Overall, we are very satisfied.