If you live in central Florida then a dehumidifier or drier jar as they are often called is the best investment that you can make for your hearing aids. Moisture and humidity are the major cause of hearing aid repairs. Some hearing aids are marketed as moisture resistant however these will also succumb to the humid Florida environment over time.
When you are not wearing your hearing aids they should be stored in a drier jar. Gardner Audiology stocks two sizes. The larger one is more convenient if you own more than one hearing aid.