Portable humidifiers are available for purchase online from many retailers, including Amazon, Target, Wal-Mart and Bed Bath & Beyond. While the water capacity of portable humidifiers varies, it typically ranges from 16 ounces to 5 gallons.
The two types of portable humidifiers are personal humidifiers and room humidifiers. Good for travel or use in an office, personal humidifiers are very small and provide limited coverage. Room humidifiers are generally larger and are designed to provide humidification to an entire room. When buying a humidifier, it's important to consider the size of the humidifier, how frequently it requires refilling and the noise level when it is in use.