If you live in a place with a dry climate, you might need a good air humidifier to balance the air in your apartment or house. Another reason to have an air humidifier on hand is if someone in your family gets a cold or flu. You can put one in their room so that they can breath warm, humid air. This will help them to breath easily by opening up nasal passages. Especially at night, this can be useful to help them sleep more soundly. If you don't want to spend a lot of money, but an air humidifier from a wholesale dealer before you need it.