ClickCease MRCOOL mini-split: Guide to cleaning the indoor unit – FrosthubUSA

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MRCOOL mini-split: Guide to cleaning the indoor unit


The MRCOOL DIY Mini Split air conditioner is a popular choice and ideal system for homeowners who want a high efficiency heat pump with quick hook-up without the hassle of professional installation. However, even with easy installation and detailed instructions, maintaining the system can be a major obstacle for some. In this article, we will guide you through the steps of cleaning the indoor unit of your MRCOOL DIY ductless mini split in short hours, ensuring great air comfort and less energy usage.

Cleaning your MRCOOL mini split inside unit is essential for maintaining a healthy living space and optimal system performance. A dirty indoor air handler can lead to reduced airflow, increased energy consumption, and even mold growth. By cleaning the indoor unit regularly, you can prevent these issues and ensure that your mini split system runs smoothly.

Before we get started, let's take a look at the tools you'll need for cleaning your MRCOOL DIY mini split indoor unit:

  1. A dry cloth
  2. A damp cloth
  3. Filter panel removal tool (included with your unit)
  4. Bucket or pan
  5. Cleaning solution (optional)
  6. Soft-bristled brush or vacuum cleaner with a soft brush attachment
  7. User manual

Cleaning the Filter Panel

The first step in cleaning your indoor unit is to remove the filter front panel. This panel covers the air filters that trap dust, pollen, and other contaminants in the air. To remove the filter panel, use the included tool to unlock the panel and gently pull it off.

Once the filter panel is removed, you can clean the filters using a damp cloth. If the filters are particularly dirty, you can use a cleaning solution to remove stubborn debris. Be sure to rinse the filters thoroughly with water and allow them to dry completely before reinserting them into the unit.

Cleaning the Indoor Unit Housing

After cleaning the filters, it's time to clean the indoor unit housing. Using a damp cloth, wipe down the interior of the unit to remove any dust or debris that may have accumulated. Be sure to pay extra attention to the fan blades and coils, as these areas can collect a lot of dirt over time.

If you're having trouble reaching certain areas of the indoor unit, you can use a vacuum cleaner with a soft brush attachment to gently remove dust and debris.

Cleaning the Drain Hose

The drain hose is a small tube that runs from the indoor unit to the outdoor condenser. The hose is responsible for removing condensate (water) from the indoor unit during operation. Over time, the drain hose can become clogged with debris, leading to water leaks and reduced system performance.

To clean the drain hose, simply disconnect it from the indoor unit and use a bucket or pan to catch any water that may be inside. Use a cleaning solution or a pipe cleaning brush to remove any debris that may be blocking the hose. Once the hose is clean, reconnect it to the indoor unit and ensure that it is properly seated.

Reassembling the Indoor Unit

After cleaning all the components of the indoor unit, it's time to reassemble everything. Start by reinserting the clean air filters into the filter panel and locking the panel back into place. Then, carefully slide the indoor unit housing back onto the wall unit and lock it in place.

Tips and Tricks

  • Always refer to the user manual before attempting any maintenance on your MRCOOL Mini Split.
  • Wear gloves and a mask when cleaning the unit to protect yourself from dust and dirt.
  • Clean the indoor unit at least once every six months or as recommended by the manufacturer.
  • If you're not confident in performing an amateur installation or cleaning, it's best to call a professional.
  • To maintain easy air filter maintenance, make sure to clean your filters regularly. For a step-by-step guide on how to clean your MRCOOL DIY Mini Split AC air filter.


Cleaning your MRCOOL DIY mini split indoor unit is an important part of maintaining your system's performance and ensuring great air comfort. By following these simple steps, you can keep your system running smoothly for years to come.


Q: How often should I clean my MRCOOL DIY mini split indoor unit?

A: We recommend cleaning your indoor unit at least once every three months, or more frequently if you have pets or live in a dusty environment.

Q: Can I use any cleaning solution to clean my mini-split filters?

A: We recommend using a mild detergent or a solution specifically designed for cleaning air filters. Avoid using harsh chemicals or abrasive cleaners, as these can damage the filters.

Q: Do I need any special tools to clean my MRCOOL DIY mini split indoor unit?

A: No, you do not need any special tools. The filter panel removal tool is included with your unit, and the other tools needed (dry cloth, damp cloth, bucket or pan) are common household items.

Q: Can I clean the outdoor heat pump condenser myself?

A: We recommend leaving the cleaning of the outdoor unit to a professional HVAC technician, as it requires specialized tools and training. However, you can keep the area around the outdoor unit clear of debris and vegetation to ensure proper airflow.

Q: What should I do if I have trouble cleaning my MRCOOL DIY mini split indoor unit?

A: If you're having trouble cleaning your indoor unit or need assistance with any aspect of your MRCOOL DIY series heat pump, consult the user manual or contact MRCOOL customer support for assistance.

Q: Can I clean my new unit of MRCOOL inside unit filters with water?

A: Yes, you can wash the filters with water if they are too dirty. Let them dry completely before putting them back in the unit.

Q: Can I clean the indoor unit while it's still running?

A: No, we do not recommend cleaning the indoor unit while it's running. Turn off the unit and disconnect the power before beginning any cleaning procedures.

Q: What should I do if I notice mold or mildew growth in my MRCOOL diy mini split indoor unit?

A: If you notice mold or mildew growth in your indoor unit, consult the user manual or contact MRCOOL customer support for guidance. In some cases, it may be necessary to hire a professional mold remediation specialist.

Q: How can I prevent dust and debris from accumulating in my indoor unit?

A: To prevent dust and debris from accumulating in your indoor unit, consider using a high-quality air filter and changing it regularly. You can also vacuum and dust the surrounding area regularly to reduce the amount of airborne contaminants.

Q: Is it safe to clean my MRCOOL DIY mini-split unit air handler myself?

A: Yes, cleaning your indoor unit is a safe and simple process that can be performed by most homeowners. For additional information, just be sure to follow the instructions carefully and take appropriate safety precautions, such as wearing gloves and eye protection.

Q: How long does it take to clean a MRCOOL unit air handler?

A: Cleaning your indoor unit typically takes a couple of hours, depending on the level of dirt and debris present. Be sure to set aside a specific time for cleaning and follow the instructions carefully to ensure optimal results.

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