Cool Mist Humidifiers: Increase the humidity without raising the temperature of your space. These units are helpful for allergy sufferers.
Warm Mist Humidifiers: Ideal for cooler climates, these units increase both the humidity and the temperature of a space. These units are helpful if you have a cold or flu.
Evaporative: These humidifiers can self-regulate the moisture in the air. Using a fan, water evaporates from a wick filter as a vapor without any heat.
Vaporizer: Vaporizing humidifiers may offer either cool or warm mist to produce steam to increase the level of humidity in your space.
Ultrasonic: Using an internal vibrating metal or ceramic diaphragm, ultrasonic humidifiers can produce cool or warm mist and are very quiet when operating.