In some air conditioners electric heaters will warm the air. Air conditoners can get rid of moisture from the air in many ways. Warm air can hold more moisture then cold air. When air conditioners cool the air, the air will pass over cooling coils. The water in these coils can get cold enough so that the moisture in the air turns into liquid form.
Air conditioners can also remove moisture from the air.
The air will pass through sprays of cold water. These sprays cool the air to condense some of the moisture. Controlling moisture in the winter is also important. Cold air from the outside has only a little bit of moisture. When the air is heated it becomes really dry.