The size of the dehumidifier you need will depend on several factors, such as the size of your home, the amount of moisture in the air, and any special needs you may have. For example, if you live in a very humid climate or if you want to reduce energy costs, then a larger dehumidifier might be more beneficial. On the other hand, if you live in a small apartment or only need to dehumidify one room, then a smaller model may be enough.