There is no reason not to use your dehumidifier all year, especially if you live in a particularly damp location like Florida or Washington. These areas often produce condensation and relative humidity all year, and having a humidifier will be more comfortable. But if you live in a place that suffers from very humid and damp seasons like summer and spring, but the air gets much drier in the colder months, you can use the dehumidifier as needed and even store it away when you aren’t using it.