Some Air Conditions have a dehumidifying mode! Both air conditioners and dehumidifiers draw moisture from the air within a room, reducing the humidity in a room. Whilst they both function similarly, an air conditioner’s capacity for dehumidifying is limited.   That’s not to say that if your sole purpose is to dehumidify that you should buy an Air Conditioning unit. Whilst an Air Conditioning unit’s dehumidifying capacities are limited. They can work in tandem to reduce mould and mildew in the air and cool it to your comfort. It all depends on the environment you want to use the machines.- A cold, damp basement will benefit more with a dehumidifier, whereas an office will benefit more from an air conditioner.