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HCM-750 / HEV355
Cool, filtered invisible moisture.
A fan blows moisture off a saturated wicking filter helping it evaporate into the air more quickly.
The moisture output is invisible, since the water is evaporating off the filter.
It is not possible to over-humidify because the air will not absorb any more moisture than it can hold.
This type of humidifier requires a replaceable wicking filter to operate. The filter also captures minerals from the water, helping to prevent white dust in hard water areas.
See filtered cool moisture humidifiers
Cool, filter-free visible mist.
A nebulizer vibrates at ultrasonic frequency, breaking water droplets into fine visible mist that you can see.
This type of humidifier is filter free, but some will accept an optional demineralization cartridge that helps to remove minerals from the water, reducing white dust in hard water areas.
Ultrasonic humidifiers are generally very quiet but you may hear the sound of water dripping as it falls into the reservoir.
See filter free cool mist humidifiers
HUL520B / HUT-300B
HWM-340B / HWM705B
Warm, filter-free visible mist.
Water is boiled in a heating chamber and is then released into the air as warm, visible mist.
This type of humidifier produces 99% bacteria free mist, since the water is boiled first.
Some warm mist humidifiers come with a medicine cup so liquid inhalants can be used for added relief.
You may notice the temperature in the room rises slightly since the mist is warm.
See warm mist humidifiers