Choose Cool Mist Humidifiers: An Introduction

Impeller and Ultrasonic cool mist humidifiers

Cool Mist humidifiers

Cool mist humidifiers can make a small but significant difference in how cool your home feels during hot and dry summers. Increasing the relative humidity by just 10 percent can feel like a temperature drop of one degree Fahrenheit. This may not sound like much but in combination with the relief of dry skin, chapped lips and a sore throat this slight change could seem like a blessing from above.

As the name suggests, cool mist humidifiers work by releasing a cool spray of tiny water droplets into the air. There are two main types of cool mist systems: the impeller and the ultrasonic humidifiers.

Impeller cool mist humidifiers

Normally used in HVAC systems for whole house humidifiers, impeller humidifiers use a spinning disc to throw water through a diffuser which turns the water into tiny droplets. The air flowing through the supply duct then carries these tiny droplets into the house. Portable versions that use a fan to push the droplets out into the air are also available.

Ultrasonic cool mist humidifiers

Ultrasonic humidifiers use a vibrating diaphragm to produce a fine mist which is then also pushed out into the air using a fan. These tend to be portable units only but they do come in capacities large enough to humidify an entire house. These are discussed in more detail on the ultrasonic humidifiers page.

Cool mist humidifiers need to be well maintained and regularly cleaned because, unlike steam or warm mist humidifiers, they don’t boil the water before releasing it into the air. This means that there is a higher risk of mold forming in the water reservoir along with bacteria which could be released into the air with the water vapor. It is also wise to use distilled water and filters to prevent excess minerals from coating your furniture in ‘white dust’. Always follow the manufacturer’s instructions on how to clean your cool mist humidifier.


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