10% Off + Free Shipping on Air Purifiers - Ends 3/21
H7550 Ultrasonic Warm Mist & Ultrasonic Cool Mist Humidifier by PureGuardian® H7550 Ultrasonic Warm Mist & Ultrasonic Cool Mist Humidifier by PureGuardian®
4.65 5 9

H7550 Ultrasonic Warm Mist & Ultrasonic Cool Mist Humidifier by PureGuardian®

Availability: In stock - USA and Canada SKU: H7550
MSRP: $229.99
Add to Cart


9 Review(s) Write a Review
3 Year Limited Warranty Free Support SSL Secure
Need Replacement Bulbs, Parts or Accessories?

Product Information

The 90-hour* Ultrasonic Warm and Cool Mist Humidifier guards against problems caused by dry air in the home.  It features an easy to fill large 1.32-gallon tank, ideal for use in medium 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 fine warm or cool mist into the air, which can be extended using the wands.  It is ultra-quiet making it ideal to have on while you sleep. Smart mist sensor monitors the level of humidity in the room and adjusts to your selected level.

The humidifier is equipped with an easy to use digital display, a night-light, timer and 3-speed mist control. A low water indicator light lets you know when it's time to refill the water tank. 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 setting and cool mist, also depends on atmospheric conditions.

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

Ideal For

  • Medium rooms


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

Automatic Humidity Sensor
A sensor monitors the humidity in the room and automatically adjusts output to maintain desired humidity level.

New! Extended Reach Wands
Use the extension wands to disperse an even mist throughout the entire room.

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

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

Warm or Cool Humidification
Emits both warm and cool mist.

Soft Glow Night Light
A cool blue night light with an on/off switch.

Works in Large and Small Rooms
Variable spray control works in large or small rooms.

Additional Features

  • Up to 90-hour run time*
  • 1.32 gallon tank capacity
  • Almost 14-inches tall

Product Specifications

  • SKU: H7550
  • Weight: 5.45lbs.
  • Dimensions: 5.12 x 9.76 x 13.98
  • Cord Length: 5'
  • Construction: Plastic
  • Run Time: Up to 90 hours
  • Manual: H7550 PDF Manual
  • The Guardian Technologies™ PureGuardian® 90-Hour* Smart Mist 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?
    Regular cleaning is recommended; approximately every 1–2 weeks (depending on use). 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?
    No. 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, allowing you to keep it on while you sleep.

    What is Silver Clean™ technology, and why is it used in your humidifier?
    Unlike other humidifiers that grow slimy mold and mildew, the Guardian Technologies™ PureGuardian® 90-Hour Ultrasonic Humidifier uses Silver Clean™ technology 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 and not on the floor. Placing it on a table or nightstand during operation is suggested.


    What size room will the humidifier work in?
    Thanks to the adjustable spray feature, this humidifier works well in both large and small rooms.

    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.

    How do I choose warm or cool humidification?
    Choosing warm or cool humidification is based on your preference. Warm moisture tends to make the air in the room feel warmer due to the warm vapor being released into the air. In contrast, cool moisture generally has the opposite effect, causing the air to feel cooler.

    Therefore, if you live in a warm climate, you may prefer a cool moisture humidifier, while those who live in colder climates may prefer a warm moisture humidifier.

    Do I need to heat the water first if I want to have warm humidification?
    No. It is recommended to put room temperature water into the tank for humidifying. The Guardian Technologies™ humidifier will heat and maintain the water temperature for warm humidification.

    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.

Lifestyle Image


Add Your Review * Required Information

Share Your Opinion

Let us know what you think about our products.

  • on Facebook
  • on Twitter
Have Questions?
M-F 8:30-4:30 EST
By: Veronica

Love my humidifier

Some how I can't get the humidity higher than 26 what am I doing wrong?

By: Don

Mixed review

I chose this unit over three other leading units for about the same price (Crane EE-8064, AirOSwiss AOS7147. PowerPure 5000) because I felt it had the best set of features and specs, even though not fully what I wanted. I really wanted one that did much hotter than 80 DegF, but the only one that did (the AOS) was high maintenance. I liked the simplicity of the SilverClean technology and no other filters or cleaners for this unit. I liked the control choices and the extension wands.
As soon as I tried using it, I was disappointed that the control buttons don't light up, which I assumed they did, so they are very hard to see, being gray on white. (Not good for this guy with old weak eyes.) Then, using a flashlight during the day, I got it all set the way I wanted it, turned it off and back on and found it does not save the settings! So every time I turn it on I will have to get a flashlight, change the mode to warm mist without night light (it defaults to warm with night light), the level to medium (it defaults to high), the hours to the number of hours (it defaults to 1), and the desired humidity level to my choice (it defaults to 40%). Please soon add the capability that it automatically remembers how it was last set. I was impressed with how the mist starts almost immediately upon being turned on. Also, of the four, I asked questions of technical support before buying. For Guardian, I got two answers, but they were quite weak answers to my questions. I would maybe still recommend it for the good reasons I mentioned, but not without mentioning my disappointments. I don't know whether any of the other three save their settings or have easier to read controls. If not, this one may still be the best choice.

By: Daniel Murphy

very pleased and plan on purchasing 2 more

This is an incredible product, very pleased and plan on purchasing 2 more. I have had many Humidifiers and this is by far the best one I have owned.

By: Margaret M. Gibson "nutmeg3748"


I've tried a couple of different humidifiers, several Vick's and one Crane that are cheaper. I bought these for $130. I wouldn't pay $180 as the catalogue offers advertise. It's not over twice as effective as the large Vicks. However, I believe this is the best because of the feature automatically adjusting output with the selected humidity level. It works. I have another humidity monitor and they're both at the same level, plus or minus a couple of percentage points. I think it's fairly accurate.

The drawbacks are the convoluted control buttons and lack of directional steam top. Reading the manual to adjust the night light and all of that solves the problem, but what a pain. And then a little simple mcgyvering with some tape solves the directional problem. I bought another one of these for my office at work. When I buy something again, it's a solid product.

By: Belinda Sosa


Being a resident of NJ, the air inside your apartment or home can become extremely dry. Like 28% humidity dry.
This product arrived yesterday and was plugged in right away with the hopes that it would provide a much needed good nights rest.
Whalla! I feel so much better this morning, that I felt compelled to right this review. I like this product so much and it has provided such immediate results, that I am ordering another one today. Considering how loud other humidifiers can be, this is a dream. It is very quite. The gurgling noise someone wrote about is not offensive to me. The warm mist setting is an excellent feature.
I highly recommend this product!

By: S. D. Bridge "Sankarsha Das"

Great Product

This product has given me good service. I have been running it practically non-stop for a week. It has nicely helped me in my important work of devotional service to Lord Sri Krishna, the Supreme Personality of Godhead.

By: Grandma Peachie

Best Humidifier!!

The BEST humidifier I have ever had. Found that using Distilled water works the best -- no residue at all. We have extremely hard water and even with a water softener -- it would destroy previous machines. Went to this one based on the ratings we saw and started right off with distilled water. Wonderful and I'm sure will last us for years to come!

By: Glowi


This is very quiet and puts out a lot of moisture,not like a more expensive model I bought that makes all kinds of noise.Very please with this,purchase another one for my bedroom to replace the noisy expensive one.

By: Marie Harris

Satisfied Customer

I love how much control the different settings give you. I had a previous model which I used for years but decided to upgrade. Glad I did. Once you get the hang of filling it up, it's a winner.