A humidifier is a household appliance that can increase the humidity of a room. It can humidify a specific room, or it can be connected to a boiler or central air conditioning system to humidify an entire building.
Air purifiers are mainly used to purify indoor air, including formaldehyde, odor, dust, second-hand smoke, bacteria, mold, pollen and so on.
Dehumidifier is mainly used to reduce or constant indoor air humidity, part of the dehumidifier with humidification function, can regulate the air humidity within a certain range.
Their functions are not the same.
