Customer Reviews For The Honeywell Cool Moisture Humidifier - Black, HCM-350B

Overall Rating

62 Reviews
61 customers recommend this product
Frank A
November 14, 2022
Verified Purchase

It works very good.

Henri F
June 7, 2022
Verified Purchase

I have not opened it and used it yet as it is summer. Hoping this was worth the very long wait and all the reviews are true

Ryan L
May 26, 2022
Verified Purchase
The best humidifier.

Glad to finally have this top tier humidifier in the house. Big step up from the one we had to settle for when these were out of stock.

grace shaffner
November 13, 2020
Verified Purchase
At last my skin has stopped itching!

Both my husband and I were suffering from very dry skin. The weather was getting colder and we were stuck in our dry house. The humidifier has worked wonders and in a very short time.

Stephen Wilson
November 6, 2020
Verified Purchase

The product performs as expected, Well Satisfied.

Cade Lowry
September 16, 2020
Verified Purchase

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

Lawrence Graham
July 24, 2020
Verified Purchase

have not had the occaission to use yet

Harriette Einolf
June 1, 2020
Verified Purchase
A Wonderful Product!

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.

Diana Yruegas
May 27, 2020
Verified Purchase

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.

Sherry Chiou
April 20, 2020
Verified Purchase


Michele Johnson
April 20, 2020
Verified Purchase

Love it has helped allergies and respitory virus

Peter Mathis
April 20, 2020
Verified Purchase
Great product

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.

Gregory Evstegneev
April 20, 2020
Verified Purchase
Best Humidifiler

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!

Charles Borja
April 6, 2020
Verified Purchase
Its so perfect!

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

Ian Grace
March 22, 2020
Verified Purchase
All day humidity

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.

Edmund Fischer
March 17, 2020
Verified Purchase
Excellent Relief

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

Felicia Yauch
January 29, 2020
Verified Purchase

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!

Mahlon Fiscel
January 24, 2020
Verified Purchase
Very Satisfied

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

Ian Evans
January 6, 2020
Verified Purchase
Terrific product

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.

Robert Genn
December 19, 2019
Verified Purchase

better than expected, quiet and does the job

I hear the fan turning, but I don't see any mist. Is my humidifier operating properly?
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.
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.
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.
My filter has turned light brown and rust colored. Do I need a new filter?
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.
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?
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.

Cool Moisture Humidifier 

This Honeywell Cool Moisture Humidifier is an excellent source for introducing a steady stream of comforting humidity that can help throat and nasal passages stay hydrated. Designed with a wide tank opening, this cool moisture humidifier can easily be refilled and cleaned. The removable tank is dishwasher safe and break resistant for increased peace of mind. The availability of three speed settings allows for more control in finding the perfect moisture output and sound level for your setting. The Honeywell Cool Moisture Humidifier is an excellent choice for medium sized rooms and is capable of running up to 24 uninterrupted hours per filling.

Genuine Honeywell Wicking Filter A

This cool moisture humidifier works with Honeywell Replacement Filter A. Designed for optimal moisture output and inhibiting up to 99.99% of mold growth on the filter, this Genuine Honeywell Humidifier Wicking Filter captures minerals from the water and helps prevent the buildup of white dust. The updated version of the Honeywell Replacement Filter A features a blue pre-filter layer that helps capture large airborne particles from the air that passes through the filter.

Protec Antimicrobial Cleaning Cartridge

The Honeywell Cool Moisture 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.

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