Dehumidifiers just aren’t for the comfort of those living in a house in a humid climate. But if you live in a hot and humid climate, a dehumidifier can also help keep mold from growing in corners without proper ventilation and air flow.
And then there is the issue of allergies in your family. If anyone has allergies, a dehumidifier can make a lot of difference in keeping both mold and dust at bay.
Dehumidifiers range in price from relatively inexpensive for ones that will do just a small room, to very large (and thus expensive) ones that are capable of doing an entire house. You will need to asses your budget versus needs.