What is Daikin Dry Mode / Dehumidification Mode

Daikin Dry Mode, also known as Dehumidification Mode, is a feature found in many ducted and split-type air conditioning units, including Daikin systems. This mode is designed to reduce humidity in the air, making it more comfortable during humid but not too hot or too cold weather conditions.

Understanding Daikin Dry Mode

When the air conditioner is in Dry Mode, it sucks moisture from the air, similar to a dehumidifier. The moist air from the room is drawn into the air conditioning unit, condensed in the evaporator, and the excess moisture is removed. The dry air is then released back into the room, helping to lower the overall moisture level.

Dry Mode is different from Cool Mode and Fan Mode. Cool Mode cools the air, while Fan Mode provides air circulation without sucking moisture from the air. Dry Mode is more energy-efficient than Cool Mode, making it an attractive option for those looking to manage humidity levels without excessive energy use.

Key Considerations for Using Daikin Dry Mode

What is Daikin Dry Mode / Dehumidification ModeImage source: Daikin Air Conditioner Outdoor by Dinkun Chen

To use Dry Mode effectively, it’s essential to remember a few things:

  1. Temperature Independence: Dry Mode is not governed by the thermostat’s temperature reading. It stops running when the indoor temperature drops to a certain level, which must be manually turned on and off.

  2. Humidity Balance: Using Dry Mode for extended periods can lead to insufficient indoor moisture, causing uncomfortable symptoms like dry eyes, throat, chapped lips, and frequent nosebleeds. Excessively dry air can also result in static electricity.

  3. Optimal Usage Scenarios: Daikin Dry Mode is particularly useful during hot showers or baths, cooking, when there are extra company in the home, during dryer use, and on rainy, wet days. It is often used right before or during big rainstorms, especially in naturally humid regions or homes with many people.

Technical Aspects of Daikin Dry Mode

The Daikin Dry Mode works by utilizing the air conditioning unit’s refrigeration cycle to remove moisture from the air. Here’s a more detailed technical explanation:

  1. Refrigeration Cycle: The air conditioning unit’s compressor circulates a refrigerant through the system, which absorbs heat from the indoor air and transfers it to the outdoor unit.

  2. Evaporator Coil: As the refrigerant passes through the evaporator coil, it absorbs heat from the indoor air, causing the air to cool and the moisture in the air to condense on the coil.

  3. Condensate Removal: The condensed moisture, or condensate, is then collected in a drain pan and removed from the system, either through a drain line or by evaporation.

  4. Airflow Adjustment: In Dry Mode, the air conditioning unit’s fan speed is typically set to a lower setting to reduce the airflow, allowing more time for the air to pass over the evaporator coil and for the moisture to be removed.

  5. Temperature Regulation: The Dry Mode is not governed by the thermostat’s temperature reading, as mentioned earlier. Instead, it operates based on the moisture content in the air, stopping when the indoor temperature drops to a certain level.

  6. Energy Efficiency: Dry Mode is more energy-efficient than Cool Mode because it doesn’t need to cool the air as much to achieve the desired humidity reduction, resulting in lower energy consumption.

Maintenance and Troubleshooting

To ensure the optimal performance of Daikin Dry Mode, it’s essential to maintain the air conditioning unit regularly. This includes:

  • Cleaning the air filters to ensure proper airflow
  • Checking and cleaning the condensate drain to prevent blockages
  • Inspecting the evaporator coil for any buildup of dust or debris
  • Ensuring the refrigerant levels are correct and there are no leaks

If you encounter any issues with the Daikin Dry Mode, such as insufficient dehumidification or excessive dryness, it’s recommended to consult a professional HVAC technician for troubleshooting and repair.


Daikin Dry Mode is a valuable feature for managing indoor humidity, especially during humid but not too hot or too cold weather conditions. By understanding the technical aspects and proper usage of this mode, you can effectively maintain a comfortable and balanced indoor environment while saving energy. Remember to use Dry Mode judiciously and maintain your air conditioning unit regularly for optimal performance.

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