Guardian Technologies Pure Guardian H940 Ultrasonic Cool Mist Humidifier Review

Eileen Martin
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This is our detailed product review for the Guardian Technologies Pure Guardian H940 Ultrasonic Cool Mist Humidifier.

We’ll provide you with all the detailed information you could need. You just need to make your own final decision.

Our rating: 7 / 10

Cost: $$

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Pros:

  • Affordable
  • Makes a significant difference in air moisture levels and overall comfort … especially during the winter months
  • Elegant design
  • Has soft, soothing, and natural sounds (which can be silenced)
  • Ultrasonic technology… whisper-quiet operation (difference between ultrasonic humidifier and the cool mist humidifiers, which includes a fan)
  • No filters needed

Cons:

  • Lid doesn’t seal tightly (although the inside filter catches 99.99% of bacteria, dust, and other particles)
  • No humidity indicator (this is meant to be used in small rooms of about 350sqft)

If the humidifier you're using doesn't have a filter and relies on ultrasonic technology to generate cool mist, it's going to be more risky to use in a bedroom. I'm also not crazy about the fact that the PureGuardian H940 Ultrasonic Cool Mist Humidifier comes with no filter. You can extend the life of the filter, but they take a lot of time to replace.

If it's just in the living room or next to your bed for example, you can easily run it overnight and it's not going to present any kind of fire hazard.

This humidifier is capable of providing cool mist up to 350 square feet and will last up to 30 hours, depending on room size.

The PureGuardian H940 Ultrasonic Cool Mist Humidifier provides a long run time with the .5-gallon water tank that allows for up to 30 hours of run time, depending on room size. It's an ultrasonic machine that is capable of generating cool mist up to 350 square feet and it comes with a silver-clean filter to protect it from mold or mildew growth.

I like this one because it's quiet, has a low water indicator light and it's not very tall.

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Not what you’re looking for? Read our roundup review: 10 Best Filterless Humidifiers of 2022 – Healthy & Cost Efficient