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Color: White
  • Ultrasonic humidification technology
  • Provides soothing, visible cool mist
  • Ultra-quiet operation
  • No filters required
  • Directional mist outlet
  • Large tank opening for easy filling & cleaning
  • Essential oil feature
  • Auto shut off when empty

Filter Free Cool Mist Humidfiier

The Honeywell Ultrasonic Cool Mist Humidifier is an excellent addition for those searching to establish an improved breathing environment. Providing the height of convenience and efficiency, this humidifier by Honeywell features an ultra-quiet operation and an auto shut-off function when the tank is empty. Accessibility has also been addressed with the utilization of a large tank opening that allows for easy filling and cleaning. The Honeywell Ultrasonic Cool Mist Humidifier discharges visible cool moisture in multiple output settings. An essential oil feature has been added for increased comfort and customization. This humidifier is an ideal fit for medium sized rooms and is capable of running for 24 uninterrupted hours per filling.

Protec Antimicrobial Cleaning Cartridge

The Honeywell Ultrasonic Cool Mist Humidifier can also use Protec Humidifier Cleaning Balls. Protec Antimicrobial Cleaning Cartridges feature a patented antimicrobial, Aquastat that continuously works to hinder the growth of bacteria and mold. They're also capable of preventing the buildup of slime in the water and humidifier surfaces. Protec Antimicrobial Cleaning Cartridges work in all humidifiers and are safe/non-toxic. Aquastat contains no harsh chemicals or harsh acids making the cleaning action just as gentle as water on your humidifier surfaces and components.

What is the dust on my humidifier?
High mineral content in your water, also known as hard water, may cause a white mineral residue to accumulate on surfaces in the room near the humidifier. The higher the mineral content (hardness) of your water, the greater the potential that an Ultrasonic humidifier may produce white dust. White dust is not a result of a defect or flaw in the humidifier. It is a result of the amount of mineral suspended in the water you are using. To minimize the amount of white dust, use a mixture of distilled water with tap water in your tank.

How do I clean my Honeywell Ultrasonic Cool Moisture Humidifier?
For ultrasonic humidifiers, periodic cleaning of the nebulizer will help it perform at its best. The nebulizer, which is a round disc found in the base of the unit, vibrates at ultrasonic speed to create mist. Over time, minerals from your water may collect on the nebulizer causing it to slow to a pace that is not enough to create mist.

Turn off and unplug the humidifier. Empty water from the tank and base of the unit. Fill the base with undiluted white vinegar (just enough to cover the nebulizer) and let it soak for at least 20 minutes. If you see a strong mineral build up, you may want to let it soak longer. Do not run the humidifier with vinegar in it. Gently wipe nebulizer and reservoir area with a soft cloth to remove the mineral deposits. Empty the vinegar and rinse the base with water until the smell of vinegar is gone.

Product Details
Product Specs
Product Manuals
Honeywell Ultrasonic Cool Mist Humidifier, White Video

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HUL535W customer reviews

Overall Rating

5 Reviews
4 customers recommend this product
Honeywell Ultrasonic Cool Mist Humidifier, White Reviews
Jane B
October 14, 2022
Verified Purchase
Honeywell Humidifier

I would recommend this Honeywell Ultrasonic Cool Mist Humidifier to anyone. Very efficient, runs great, very quiet. I like the idea of not having to change a filter.

Doreen M
January 12, 2022
Verified Purchase

Very quiet, I love not having a filter to deal with

Connie Baker
May 11, 2020
Verified Purchase
Love this so much!!

This humidifier is very attractive, does not use a filter, and its fresh clean water each day. I really love it and will certainly purchase it again when needed.

Charles Baker
May 11, 2020
Verified Purchase
Adding moisture for our health

Does add cool mist to our dry air. Leaks a little water from the base when you remove tank to fill it. Condensation comes out the top when you flip it over also. Other wise it works well.

Carol Kroslow
December 23, 2019
Verified Purchase

The humidifier I purchased from Honeywell recently works very efficiently and easy to handle.

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