An air conditioning unit not only cools the air in a space, it also dehumidifies it as a normal consequence of its cooling a room’s air. If you would notice, many air conditioners allow water to drip outside. Newer types use a fan and a condensing coil to direct the water vapor outside. However, it must be noted that they are not as efficient as other types of dehumidifiers, namely the mechanical and the dessicantive types. They can however, work especially well with other dehumidifiers, removing the need for the thermostat to be especially low.