I have read Harry blog about the ultrasonic humidifier. It is very good that its produces less or no noise. I did a check on Wikipedia about the humidifier- Ultrasonic Humidifier — A metal diaphragm vibrating at an ultrasonic frequency creates water droplets that silently exit the humidifier in the form of a cool fog. Ultrasonic Humidifiers should be cleaned regularly to avoid bacterial contamination which may be projected into the air.
Ultrasonic humidifier require more cleaning.....But if not that trouble to maintain, still worth to try.
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