If you're wondering what is the best setting for dry mode, your air conditioner should be set to a temperature of 25°C. The air conditioner will reduce moisture until the room's temperature reaches 25°C, assuming the thermostat is set to 25°C and the humidity level is around 90%.
The dry mode is not a common feature of all air-cons. It will be available in some varieties of window units and central air conditioning. Reducing humidity in a room is the major function of a dry mode. If the humidity in a room is high, it can increase the temperature. The dry mode can reduce the temperature in a room by reducing humidity.
Moving the air around plus a bit of heating would probably do similar. Not quite true. They aren't rated the same. Heat pumps moisture removal is rated per hour, where as a dehumidifier is rated per day. So based on the specs above. Your heat pump would remove 24L per day vs your dehumidifier at 15L per day.While dry mode is a great feature to have on an air conditioner, the only systems that offer this feature are systems with a multi-speed compressor. Being able to slow down the compressor, and thereby the cooling process of the refrigerant, is the main way that an air conditioner can remove humidity without lowering the temperature of your home..