Best Cool Mist Humidifiers – Complete Guide

Cool Mist Humidifiers are a great relief in the harsh summers or whenever the environment around us becomes very dry. Furthermore, the dryness in the air can cause various health related problems such as- Asthma, Eczema, Dry Sinuses, Skin Irritations, etc. That is why, doctors always recommend the use of the best cool mist humidifiers for people who are prone to such allergies and symptoms.

Intrinsically, a cool mist humidifier helps you by maintaining the appropriate level of humidity in your room (35-40%) and spreads a soothing mist, free from microbes and impurities, so that you can breathe in a completely hygienic environment.

Generally, Cool Mist Humidifiers are of 3 main types – Evaporative, Ultrasonic, and Impeller. All of these three types are based on different mechanisms and technology. And all these types have their respective advantages and drawbacks, respectively.

In this article, we present you a list of best available Cool Mist Humidifiers, which are available in the market today. You can evaluate each one of the models and select the best device in accordance with your requirement, budget and comfort.

1. Air-O-Swiss AOS 7147 Ultrasonic Humidifier – Warm and Cool Mist

Air-O-Swiss is the leading humidifier manufacturing company, known for its state of the art designs and technologies. The company is known to manufacture the best ‘Ultrasonic’ humidifiers, that run seamlessly and silently to ensure you a noise free operation. Similarly, the AOS 7147 is a great device with dual capabilities of Warm and Cool Mist. Being an Ultrasonic, you can be sure of its noise free operation as well.

Moreover, it is a great performer, able to humidify medium sized rooms up to 600 square feet. It also incorporates the ITC technology (Intelligent Temperature Compensation) which maintains the appropriate amount of humidity in your room, automatically. In addition to that, this device has digital touch controls and a bright LCD display, transparent water tank to easily check the water level of the unit, sleep mode which enables device to run through the night without running out of water.

2. Optimus U-31001 1.5-Gallon Cool Mist Ultrasonic Humidifier

The Optimus U-31001 is a very budget friendly Cool Mist Humidifier, which incorporates very competent features and performs equally well. It has a number of features, which make it a steal at this price, including – transparent water tank, automatic shut off, refill indicator, virtually noise free operation, etc.

Performance wise, it is a very potent device. It has a 1.11 gallons tank capacity and is able to humidify small to medium sized rooms effectively. Even during the night, its inbuilt nightlight won’t disturb you, thanks to its soothing illumination. While it has all the good features of modern Ultrasonic humidifiers, it lacks any automatic controls and a digital display. Though the manual mist control knob, present at the front of the device is very easy to understand and use. Thus, you can effortlessly adjust the level of humidity required, by rotating the knob.

3. Honeywell QuietCare Humidifier HCM-6009

The Honeywell QuietCare HCM 6009 is a humidifier for large rooms, as it can humidify areas up to 2300 square feet. This big device comes with 3.4 gallons tank capacity and can produce 9 gallons of output per day. The device also has the capability to run for 24 hours consecutively, without the need of any refill. Apart from that, it has 3 different humidity settings and manual knob controls present at the top of the device. Besides the fact that it is a big humidifier, it is also one of the quietest ones in its category. As it produces almost 30% less noise than its counterparts from other companies.

Furthermore, the device incorporates the use of an Air Washing pre-filter  which effectively filters out dust, pollens or other dirt particles. Whereas, its antimicrobial treated filter, prevents any accumulation of microbes such as РBacteria, Fungus and Molds, etc.

4. Optimus U-31002 1.5-Gallon Cool Mist Ultrasonic Humidifier

The Optimus U-31002 is another budget friendly solution for your humidification needs. This device is an Ultrasonic type and has a 1.11 gallons tank capacity and produces 1.5 gallons of cool mist in 18 hours. Furthermore, the humidifier features a very ergonomic design with a transparent tank to easily monitor the water level, anytime you want. Besides its suave design, the design is very compact and light weight, enabling you to easily place it inside your room.

In addition to that, the Optimus U-31002 features an adjustable mist control, automatic shut down, refill indicator and a very soothing night light, which can be turned off if you don’t require it. Performance wise, it is a very potent device and spreads the cool mist thoroughly in your room. Being an Ultrasonic type, it is very silent in its operation. Thus, ensuring you a sound sleep throughout the night.

5. Honeywell HUL535W Cool Mist Humidifier

The Honeywell HUL535W is an Ultrasonic cool mist humidifier, which is a very good performer and is easy on your budget as well. It effortlessly produces soothing cool mist which is spread evenly throughout a room, and provides you a very comforting experience. It is able to humidify medium sized rooms and can run up to 24 hours in a single refill, thanks to its 1 gallon water tank. Further, it incorporates variable output settings to suit your different humidity requirements.

In addition to that, it features a rotating mist outlet that allows you to manually set the direction of the mist. More so, the control knob present at the device which regulates the amount of mist output, is very easy to handle and control. Additionally, it has an automatic shutdown feature and a refill indicator as well. Due to its large tank opening, it is very easy to wash and clean the tank, whenever required.

6. Honeywell Germ Free Cool Mist Humidifier, HCM-350

The Honeywell HCM-350 is a cool mist humidifier that uses Evaporative technology to produce a soothing fine mist. Being of the Evaporative type, it kills 99.9% of the Bacteria and other microbes present in the water. Unlike other Evaporative humidifiers, it uses the QuietCare technology which helps it to work at very low noise levels. Regarding its design, it is a very elegantly designed humidifier and incorporates a transparent blue water tank to easily monitor the water level. Additionally, it incorporates a break resistant water tank, antimicrobial treated fitted – HAC 504AW, and an automatic moisture balance system.

Performance wise, it is a good humidifier with a 2 gallons tank capacity, which produces about 8 gallons of output in one day. Further, it has the capability to humidify medium to large sized rooms effectively. Besides that, its large tank opening allows it to be cleaned easily without any hassle.

7. OPTIMUS U-31003 Cool Mist Ultrasonic Humidifier

The Optimus U-31003 is another good humidifier from Optimus. It is a cool mist humidifier which works on Ultrasonic technology. Thus, ensuring you a completely noise free operation during your sleep. It also has all the nice set of features including , automatic shutoff, adjustable mist control, transparent water tank and a refill light.

Performance wise, it has 1.5 gallons water tank, that can run seamlessly up to 18 hours. It is an ideal device for medium sized rooms and has button controls, present at the front. Additional features include, Timer function to set the running time of the unit for 2, 8 and 12 hours, LED indicators, Night light, and a sturdy design for high durability.

Besides the fact that it is a really good performer, it is also very budget friendly device that won’t put much burden on your pocket.

8. Vicks VUL520W Filter-Free Cool Mist Humidifier

Last but not the least, we present you the Vicks VUL520W filter free cool mist humidifier. As the name suggests, it is a filter free humidifier and hence, you won’t need any extra filters to ensure hygienic output. Furthermore, the ergonomic design of this design suits everyone. While, its basic structure allows it to be easily cleaned and maintained.

Performance wise, the Vicks VUL520W has a small 0.5 gallon capacity, which can run for 10 hours consecutively. Though the device is small, but it is a very potent performer, ideal for small to medium sized rooms. Additionally, it has a variable humidity controls, with which you can adjust the amount of humidity required in your room. Besides that, it has all the nice set of features such as – automatic shut off, nightlight, ability to add custom fragrances, etc. Other than that, it has a completely noise free operation, too. Considering its size, it is a feature packed little device that is ideal for you, if you want to get rid of dry air related allergies.


We have tried to shortlist the best cool mist humidifiers available in the market. All these models are different from one another and have certain specific advantages, which make them unique. We have tried to cut down your task of doing extensive research on these devices, by providing useful insights and benefits of each model.