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What Is an Ultrasonic Humidifier? Ultrasonic humidifiers rely on a highly efficient technology that expels tiny water droplets into the air that evaporate into water vapor, humidifying the space. Traditional humidifiers use heat or other methods to evaporate water inside the unit then expel the vapor into the air. Ultrasonic humidifiers are also quieter and lower maintenance than traditional evaporative humidifiers. With ultrasonic units, you never have to replace filters or wicks, and there’s n