Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B

  • Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B
  • Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B
  • Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B
  • Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B
  • Honeywell UV Cool Moisture Germ Free Humidifier, HCM-350B
Germ-free, cool moisture for temporary relief of dry air discomforts
Availability: In Stock
Regular: $89.95
Price: $73.45
You Save: $16.50 (18% Off)
  • Patented germ killing process continuously kills up to 99.9% of water-bred germs, bacteria, mold and spores in the water
  • QuietCare Technology is up to 25% quieter than similar evaporative humidifiers
  • Soothing, invisible moisture to relieve dry air discomforts
  • 3 speed settings to adjust moisture output and sound level
  • Easy to fill, clean & carry
    • Wide tank opening
    • Dishwasher safe water tank & tray
    • Large recessed tank handle
  • Integrated break resistant water tank
  • Self-regulating evaporative system
  • Room Size: Medium
  • Moisture Type: invisible cool moisture
  • Run time per filling: up to 24 hours
  • Tank Capacity: 1.1 gallon
  • Uses HAC-504 series replacement Filter A
  • 3 year limited warranty

The Honeywell UV Cool Moisture Germ Free Humidifier is efficient in establishing a clean breathing environment. The use of a patented UV germ killing process allows this cool moisture humidifier to steadily eliminate up to 99.9% of bacteria, mold, fungus, and virus in the unit's water. Releasing cool, filtered invisible moisture into the air via QuietCare Technology, this germ killing humidifier provides a 25% quieter experience when compared to other evaporative humidifiers. 

Incredibly versatile by design, this Honeywell UV Cool Moisture Germ Free Humidifier comes with 3 speed settings that will allow owners to adjust moisture output and sound levels. Accessibility remains an integral design feature as this portable humidifier excels on multiple fronts. Featuring a break resistant exterior, the water tank can be conveniently reached via a wide opening. The tank itself also includes a handle that will allow you to easily remove the tank to refill and clean when necessary. This portable humidifier’s tank and tray are dishwater safe. Weighing less than 9 lbs. as a whole, the Honeywell UV Moisture Germ Free Humidifier is an ideal fit for medium sized rooms and is capable of running up to 24 uninterrupted hours per filling.

Product Specs

Helps Temporarily Relieve Dry Air Discomforts

  • Provides an efficient solution for counteracting the effects of dry harsh winter air by adding essential moisture to any room. Soothe dry skin with added moisture so hands and lips are no longer dry.

Helps temporarily Relieve Congestion and Cough

  • Maintaining an indoor humidity level between 40-60% can reduce the survival of flu viruses on surfaces and in the air.*
  • *Studies have shown that keeping indoor air at an RH level of 40-60% reduces survival of flu viruses on surfaces and in the air compared to lower RH levels.

Helps You Breathe Better and Sleep More Comfortably

  • Comfortable humidity helps purify the air and keep throat and nasal passages hydrated. This can help you breathe better and sleep more comfortably.

Helps Protect Wooden Furniture, Floors and Musical Instruments

  • Low humidity causes wood to lose moisture and shrink. Extreme changes can causes warping and cracking.

Helps Keep Indoor Plants Healthy

  • Symptoms of dry air include curled leaves and dry leaf tips. Flower buds may even turn brown and fall off. Using a humidifier can help return moisture to the air promoting improved plant growth.

Helps Reduce Static Electricity

  • Static electricity is even more active when the air is dry, especially in the cold months when people turn on their heat. Returning moisture to dry air assists in reducing static shocks and static cling.
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Average score based on 57 reviews

Rating: 4.9/5Rating: 4.9/5Rating: 4.9/5Rating: 4.9/5Rating: 4.9/5

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Excellent

Reviewed: 09/16/2020 by Cade Lowry

I am a huge fan of this humidifier. It is one of the best on the market! No Doubt!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 07/24/2020 by Lawrence Graham

have not had the occaission to use yet

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5A Wonderful Product!

Reviewed: 06/01/2020 by Harriette Einolf

The humidifier was easy to set up and very easy to refill. All three settings, even the most powerful one, did not disturb my sleep. I have noticed the improvement that sleeping with the humidifier makes: no itchy, dry eyes, less dry skin and even an improvement in my nose getting more humidity - more physical comfort over all.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5EASY SETUP!!

Reviewed: 05/27/2020 by Diana Yruegas

I really appreciate how easy the setup is. This is my first humidifier and even though Id researched before purchasing, you never quite know until you open the box. One thing I wish Id realized beforehand was the spacing needed for the setup. I live in a small apartment and it wasnt easy to find a spot that would allow me to have the machine a foot away from the wall and 4 feet away from the bed, and up not on the floor to make sure theres good air circulation. And also the need for a tray underneath the unit. I realized once I opened the box, and read the manual I saw that the large print, they take no responsibility for water damage on furniture. That's fine and reasonable - I just wish I'd known that ahead of time because finding an suitable tray to fit underneath the unit wasn't an easy task - especially with having to online shop. I'm not sure if Honeywell has ever considered it, but offering a black tray with a 1 lip all around, would be a great thing. I would have added that to my purchase vs having to hunt one down before setting up its taken me a month to find one.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 04/20/2020 by Sherry Chiou


Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 04/20/2020 by Michele Johnson

Love it has helped allergies and respitory virus

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Great product

Reviewed: 04/20/2020 by Peter Mathis

Great comfort having a humidifier that both filters the water as well as having a UV light to make the water as clean as possible before vaporizing it. Appreciate that it has 3 speeds and is fairly quiet too. Overall, very happy with it.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Best Humidifiler

Reviewed: 04/20/2020 by Gregory Evstegneev

After checking reviews on line I found this product and let me tell this is best Humidifier I ever had,quite,easy set up and most important UV germ free protection.Great product!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Its so perfect!

Reviewed: 04/06/2020 by Charles Borja

Honeywell is the name you can really trust 100%! The humidifier really helps our sleep so smooth!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5All day humidity

Reviewed: 03/22/2020 by Ian Grace

On the lowest setting this will run all day on a full tank which is good for maintaining a base humidity. The highest setting will still run for several hours. This a big improvement over my previous humidifier and the benefits are noticeable especially during winter months. I've had it for two months with no issues. Regularly cleaning the filter is probably a good idea. I take it out and let dry once a week. I run it through water before putting it back.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Excellent Relief

Reviewed: 03/17/2020 by Edmund Fischer

Works like a charm! Easy to use and quickly brought up humidity levels to where they needed to be. Great Relief.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5LOVE IT!

Reviewed: 01/29/2020 by Felicia Yauch

This is the BEST humidifier on the market for hard water in my opinion. Daily/Weekly cleaning is very minimal and its pretty quiet. I live in a decent-sized studio apartment and it keeps the humidity steady. When I first turned it on, I turned it to high because the humidity was 18%. After about an hour and a half, it was up to 52%, so I switched it to low. I can keep it set to low all day and night and the humidity will stay around 42-45%, it's wonderful. The difference was tremendously noticeable after just the first night. I woke up with a clear nose, I slept with my mouth closed, my eyes weren't itchy and red I have severe dry eyes and skin, and my head didn't ache. Definitely get the humidity monitor with digital display, as well as the antimicrobial cleaning cartridge, and change the filter every 30 days. I have had this for a month and there is no slime in the base, nor is there the stale/moldy smell that was typical in humidifiers I had before. The tank and base are completely separate from the machine, so the chance of mold and mildew building up seems next to impossible to be able to occur. I don't have a dishwasher, so every week I wipe the base and tank with vinegar and it works just fine. I pour a decent amount of vinegar into the tank and shake it vigorously without the cleaning cartridge and after rinsing both the tank and base thoroughly, there is never a lingering smell of vinegar. Do NOT waste your time researching humidifiers, this is hands down the best one out there for hard water! I am not certain if its meant for filtered or distilled water, but if it is, get it!

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Very Satisfied

Reviewed: 01/24/2020 by Mahlon Fiscel

The HCM-3508B was easy to set up, has performed very well, and is easy to clean

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Terrific product

Reviewed: 01/06/2020 by Ian Evans

This product keeps the air in my 20x20 bedroom just right and I barely notice it running on low and moderate setting. It is audible at the highest setting but it is a soothing whir. Best of all, no more dry, cracking skin or bloody noses in the morning! I wouldn't say that it is completely going to eliminate the white powdery residue in your house unless you use filtered or distilled water but it makes a huge difference compared to many other comparable units.

Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5Rating: 5/5

Reviewed: 12/19/2019 by Robert Genn

better than expected, quiet and does the job

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Q: I hear the fan turning, but I don't see any mist. Is my humidifier operating properly?
A: Dry air is pulled through the system and a fan disperses invisible, moisture balanced air. There is no "mist" emitted. When operating normally you will feel only cool air coming from the unit. Monitor the water level in your Tank/Base. If you notice a decrease in the Water Tank over 24 hours then the unit is operating normally.

Q: My unit has been running for several hours. I hear the fan spinning, but I do not notice the water level in the tank decreasing.
A: First, check the filter to ensure it is wet. If the pad appears dry, remove it from the Base and gently rinse under cool water. Reposition wet filter in the Base. You may also want to note the current moisture level in your home. If the humidity level is over 60% the unit will not put out much moisture as your air is already saturated. Also verify the upper enclosure and water tank are properly seated.

Q: My filter has turned light brown and rust colored. Do I need a new filter?
A: Probably not. Since your filter has been made with Protec antimicrobial, the change in color indicates only a mineral deposit. Soak filter in a sink full of cool water to help break up deposits. The discoloration may remain but will not affect the humidifier's performance.

Q: My humidifier doesn't appear to be as clean as when I first purchased and/or I'm smelling an unpleasant odor. What should I do?
A: You probably need to replace your Protec Antimicrobial Cartridge. This cartridge helps your humidifier stay cleaner, longer and helps freshen the mist. If you have been using your humidifier regularly for over 30 days replace the Protec cartridge and follow the cleaning instructions.

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