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H940 0.5-Gallon Ultrasonic Cool Mist Humidifier by PureGuardian® H940 0.5-Gallon Ultrasonic Cool Mist Humidifier by PureGuardian®
4.65 5 6

H940 0.5-Gallon Ultrasonic Cool Mist Humidifier by PureGuardian®

Availability: In stock - USA and Canada SKU: H940
MSRP: $59.99
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Product Information

The 30-hour* Ultrasonic Cool Mist Humidifier guards against problems caused by dry air in the home.  It features an easy to fill .5 gallon tank, ideal for use in small sized rooms.  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. 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. Order yours now! 

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

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

Ideal For

  • Small rooms


A .5 gallon tank provides up to 30-hours* of run time and is great for small sized rooms

Silver Clean™ Protection fights the growth of mold and mildew on the surface of the water tank

Ultrasonic Technology quietly disperses a fine mist providing relief from the dry air

Optimize comfort with soothing low and high cool mist settings

Slender desktop design features an optional night light

Additional Features
  • Directional mist nozzle
  • Refill light indicator
  • Auto shut off when empty
  • Eliminates evaporating filters that must be cleaned or replaced and breed mold and mildew

Product Specifications

  • SKU: H940
  • Weight: 2lbs.
  • Dimensions: 7.32 x 7.32 x 15.35
  • Input Voltage: 120V, 50/60Hz
  • Cord Length: 5'
  • Bulb Wattage 23W
  • Construction: Plastic
  • Run Time: Up to 30 hours
  • Manual: H940 PDF Manual
  • The PureGuardian® 30-Hour* .5-Gallon Ultrasonic Cool Mist 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 Table-Top 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 1-year 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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Great product. Would buy again.

Works great. Reliable.

By: Jayme

As described

This item is silent and does exactly as promised. Thank you.

By: Fran

Well Designed

Effective and easy to use, User manual clear and concise.

By: Kroling

Good Brand Good Performance Strange Shape

I am overall not a fan of this model. I purchased two PureGuardian humidifiers the .5 gal and 1 gal. I found that the shape of this was tall with a long tank and large base taking up more space than necessary on your bedside table. It performs well, quiet and water vapor propelled upward. I would recommend another style unless this is your aesthetic.

By: Anonymous

Compact, eye-catching, excellent mist output

LOVE the look of this humidifier. It didn't take up much space and it's easy to fill. Output is excellent! I highly recommend this humidifier. It ran all night and didn't have to refill until the morning.

By: Pistachioeater

nice, clean, quiet, effective, and cute blue

This humidifier came just in time for me because right now I have a bad cold. I immediately placed water into it and put it on. The cool mist came out quickly in no time. I was able to direct the nozzle of mist to my direction and breathe the cool air and mist to make my breathing soooooo much better.
It is silent, and looks so very cute. The blue color is wonderfully soothing, as is the mist. My entire bedroom received great air for me to breathe with. It lasted a very long time. It has an automatic shut off when tank is almost empty. It has a cute night light that you can put on/off. It also has a feature of Silver Clean protection that fights the growth of mold and mildew on the surface of the Water Tank which is very important in humidifiers. You don't need to deal with slime with this unit. My nose opened up I was able to breathe. It is an ultrasonic Humidifier that can give you mist for 30 hours.
It is just the right size. Even though it can hold half a gallon of water it is not a large space consuming unit. It is shaped as you see above, like a kind of "tear" or a" rounded pyramid". Very smart shape. The white nozzle on top comes off when the unit is not is use, and when it is you can maneuver it to any location you prefer to have the mist hit the air. You can set the mist to low or high depending on your needs and requirements. I like it a lot, and recommend it highly for its efficiency and ease of use. Very nice unit, very good quality, and looking good.