Question: what is the difference between ultrasonic humidifiers and cool mist?
Answer: As mentioned before, ultrasonic humidifiers use vibrations to send water droplets into the air. Evaporative humidifiers, however, evaporate water inside the humidifier and send water vapor into the air. ... These are known as steam humidifiers, or as “warm mist” humidifiers if the vapor is cooled before being emitted.