Honeywell Germ Free Cool Mist Humidifier, HCM-350 Review



If you ever wished you had a humidifier that also purifies the water that goes through it, the Honeywell Germ Free Cool Mist Humidifier, HCM – 350 combines those features into one efficient unit. It comes with an antimicrobial filter so you can use hard water or tap water and still have fresh cool mist.

Aside from that, it also has a UV light that kills 99.9% of germs in the water path. But how useful are those filter and germ killing features? Do they really help in increasing moisture in the air? In this review, we will look at its features and what makes this product different from other humidifiers to help you decide if this is the right model for your home.

Honeywell Germ Free Cool Mist Humidifier, HCM-350

Important Features and Specs

The Honeywell HCM-350 helps increase the moisture in the air to help relive irritation caused by dry air, whether in the cold or dry season. It helps soothe dry skin, especially in the winter when you are likely to find dry skin building up on your eyes or lips. This is great when your air conditioning doesn’t have humidity control. It also helps ease breathing, especially when you or your kids have cough, cold, or allergies.

The humidifier comes in soft white housing and blue tank, and looks elegant enough to be displayed in your house. It is a little bulkier and must be placed on the floor instead of an elevated surface, to maximize its output for the entire room. It is sturdy, with dimensions of 18.6 x 10.4 x 13 inches, Width, Depth, and Height and weighs 9.6 pounds.

Its most unique feature is the UV light (ultraviolet light) on the base of the machine which purifies the water as it passes through before the mist is produced. It is called Germ Free because it is able kill bacteria, mold, fungus, and virus that can be useful present in tap water.

It can kill E. Coli, P. Citrine, akong others up to 99.9% after 2 hours of continuous use. Aside from that, it also comes with a filter that catches mineral deposits from hard water which can affect the mist. Experts say it is still the best to use distilled water for humidifiers. But as that can be very expensive, a good filter would be very useful to save on operation costs.

It has three mist settings, from low to high. The unit will run up to 24 hours on low setting. It is ideal for average sized rooms or small apartments. Unlike most cool mist humidifiers, there is no visible mist that comes out of the machine. When you fill the tank with water and turn it on, the fan will start and generate moisture in the air but you will not see the mist as compared to other models.

It is easy to clean and fill the tank. The tank conveniently locks in on the front of the unit and has a big handle so you can carry it in one hand to the sink. The tank is also break resistant in case you drop it. Most parts are dishwasher safe so you don’t have to worry about cleaning.

You just have to wipe the base. If you use hard water, it is important to replace the filter every once in a while. One tip for making the filter last longer, is you can turn it upside down every now and then, so one side doesn’t get too dirty at once. You can also rinse it very lightly with warm water.


  • Filters water
  • Kills germs, molds, fungus and virus
  • Easy to use
  • Dishwasher safe
  • Break resistant tank
  • Quiet


  • Bulky
  • Must be placed on the floor
  • Filters can be expensive

Who Should Buy

If you’re looking for a humidifier that also filters the water, the Honeywell Germ Free HCM-350 is one of the most popular models. But if you don’t like dealing with filters or having to replace them, you should get an ultrasonic type instead.

It features a unique UV light that kills germs, molds, fungus, and virus so this is also great for those who have little kids and babies at home. It is moderately priced so it is good for those who are on a budget but you might want to consider the filter costs, although they only need replacement after four to six months. It is great for any standard sized rooms.


The Honeywell Germ Free Cool Mist Humidifier, HCM-350 is a great humidifier for standard sized rooms that can take care of dry skin during the winter and help ease breathing. It purifies water and kills germs so it is great for kids and babies. It offers three mist settings, easy to use and clean, and moderately priced for all its features.