The Ultimate Guide to Mini Split with Dehumidifier: A Comprehensive Hands-on Approach

A mini-split system can be an effective solution for dehumidifying a space, but its performance may not match that of a dedicated dehumidifier, especially in regions with high humidity levels. Most ductless mini-splits come equipped with a dry mode and dehumidifying features that can help reduce the relative humidity in the air. However, if you reside in an area with exceptionally high humidity, your mini-split unit may still require an additional dehumidifier to achieve optimal results.

Understanding Mini Split Dehumidifier Capacity

A mini-split dehumidifier’s capacity is measured in pints of moisture removed per day. On average, a typical unit can extract around 30 pints of moisture from the air daily. However, the actual amount of moisture that a mini-split dehumidifier can remove from your home will depend on several factors, including:

  1. Indoor Relative Humidity Levels: The higher the indoor humidity, the more moisture the dehumidifier will need to extract to maintain a comfortable environment.
  2. Unit Size: Larger mini-split systems generally have a higher dehumidification capacity compared to smaller units.
  3. Airflow: Proper airflow is crucial for efficient dehumidification. Obstructions or poor air circulation can reduce the unit’s effectiveness.

To determine the optimal dehumidification capacity for your space, it’s recommended to consult with a qualified HVAC professional who can assess your specific needs and recommend the appropriate mini-split system.

Dry Mode and Dehumidifier Function in Mini Splits

mini split with dehumidifierImage source: Flickr

Most ductless mini-split systems come equipped with a dry mode, which is designed to remove moisture from the warm air. This feature can be particularly useful in humid climates or areas with high humidity levels. The dry mode works by lowering the air temperature, causing water molecules to condense. The condensed water is then collected in a tray and drained away.

In addition to the dry mode, some mini-split systems also offer a dedicated dehumidifier function. This feature can reduce the moisture content in the air without significantly lowering the temperature, providing a more targeted approach to dehumidification.

To utilize the dehumidifier function, you’ll need to ensure that your mini-split system is compatible with the specific model of dehumidifier you plan to use. While most dehumidifiers are generally compatible with most mini-splits, it’s always best to consult with the manufacturer to confirm compatibility and ensure proper installation.

Integrating a Dehumidifier with a Mini Split System

If your mini-split system does not have a built-in dehumidifier or the dehumidification capacity is insufficient for your needs, you can consider adding a standalone dehumidifier to your setup. Here’s a step-by-step guide on how to integrate a dehumidifier with your mini-split system:

  1. Compatibility Check: Ensure that the dehumidifier you’ve selected is compatible with your specific mini-split model. Consult the manufacturer’s instructions or reach out to their technical support team to confirm compatibility.
  2. Placement Considerations: Determine the optimal placement for the dehumidifier. It should be located in close proximity to the mini-split indoor unit to ensure efficient air circulation and dehumidification.
  3. Drainage Setup: Properly set up the drainage system for the dehumidifier. This may involve installing a condensate pump or connecting the drainage hose to a suitable outlet, such as a floor drain or a sump pump.
  4. Electrical Connections: Ensure that the dehumidifier is properly connected to a power source, either by plugging it into a dedicated electrical outlet or by integrating it into the mini-split system’s electrical wiring.
  5. Airflow Optimization: Adjust the airflow patterns and fan speeds of both the mini-split and the dehumidifier to achieve optimal air circulation and dehumidification.
  6. Thermostat and Humidity Control: Integrate the dehumidifier’s controls with the mini-split system’s thermostat and humidity control settings to maintain a comfortable and energy-efficient environment.

It’s important to follow the manufacturer’s instructions carefully during the installation process to ensure the safe and proper integration of the dehumidifier with your mini-split system.

Factors to Consider When Choosing a Mini Split with Dehumidifier

When selecting a mini-split system with dehumidifier capabilities, there are several factors to consider:

  1. Dehumidification Capacity: Determine the appropriate dehumidification capacity based on the size of the space you need to condition and the local humidity levels.
  2. Energy Efficiency: Look for mini-split systems with high energy efficiency ratings (SEER, HSPF) to minimize energy consumption and operating costs.
  3. Noise Level: Consider the noise level of the indoor and outdoor units, especially if the system will be installed in a living space or bedroom.
  4. Smart Features: Opt for mini-splits with advanced features like Wi-Fi connectivity, remote control, and programmable settings for enhanced convenience and energy management.
  5. Warranty and Maintenance: Investigate the manufacturer’s warranty coverage and the availability of local service and maintenance support.

By carefully evaluating these factors, you can select a mini-split system with dehumidifier capabilities that best suits your home’s needs and provides efficient, reliable, and comfortable dehumidification.

Maintaining and Troubleshooting a Mini Split with Dehumidifier

Proper maintenance and troubleshooting are essential for ensuring the long-term performance and efficiency of your mini-split with dehumidifier. Here are some key maintenance and troubleshooting tips:

  1. Regular Cleaning: Regularly clean the air filters, coils, and condensate drainage system to prevent buildup of dust, debris, and mold, which can impair the dehumidifier’s performance.
  2. Drainage System Inspection: Regularly check the condensate drainage system for any blockages or leaks, and ensure proper drainage to prevent water damage.
  3. Refrigerant Level Monitoring: Monitor the refrigerant level and have a qualified HVAC technician perform periodic refrigerant recharges if necessary.
  4. Thermostat and Humidity Control Calibration: Ensure that the thermostat and humidity control settings are properly calibrated to maintain the desired temperature and humidity levels.
  5. Troubleshooting Common Issues: If you encounter issues such as insufficient dehumidification, excessive noise, or system malfunctions, refer to the manufacturer’s troubleshooting guide or consult a professional HVAC technician for assistance.

By following these maintenance and troubleshooting best practices, you can optimize the performance, efficiency, and longevity of your mini-split with dehumidifier system.


Integrating a dehumidifier with a mini-split system can be an effective solution for controlling humidity levels in your home, especially in regions with high humidity. By understanding the dehumidification capacity, dry mode and dehumidifier function, and the process of integrating a standalone dehumidifier, you can create a customized climate control system that meets your specific needs.

Remember to consult with a qualified HVAC professional to ensure the proper selection, installation, and maintenance of your mini-split with dehumidifier system for optimal performance and energy efficiency.


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