Cool mist models are slightly noisier, though some models have a \'silent\' feature for operating in bedrooms. There are basically two types of cool mist humidifiers - evaporative and ultrasonic They pass the water over a wick and expel a vapor, that cools down the room temperature and makes it easier to breathe. They vary in size and design, from units that are connected to the home\'s heating duct work to be circulated through the whole home as the heating system operates, or come in larger portable floor console units, or smaller room size models. |
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