Dehumidifier and dehumidifier are the same thing. They both use the principle of reducing dew point to separate water vapor from the air. The most popular understanding is that a glass of ice water can always condense a lot of water drops outside. The same is true for dehumidifiers, which use low temperature to condense water vapor in the air and then collect it. However, the evaporator surface of the dehumidifier uses hydrophilic materials, and the water collection efficiency is much higher than that of glass cups.