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Mould Around Air Conditioners: Causes, Risks, and Solutions

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Have you noticed dark spots being formed near your air conditioner unit? Do you smell a foul smell coming from the air conditioning system despite its operation? Have you seen some water stains forming around the walls surrounding the air conditioning system?

The major function of an air conditioner is keeping you cool and comfy; however, many problems related to moisture become the preconditions for the development of mould near your air conditioner. Sources of mould include condensation, leakages, poor drainage, humidity, and poor ventilation.

In this article, we explain what causes mould around air conditioners, where it can appear, the potential risks, how to prevent it, and when a professional mould inspection may be needed.

What Causes Mould Growth Around Air Conditioners?

There are certain moisture issues that can cause growth around the AC. It’s important to identify the reason behind the problem since a thorough clean-up of the visible part may not be the solution.

1. Condensation

  • Warm indoor air that comes into contact with a cold surface causes moisture formation via condensation. Moisture buildup on the wall or ceiling can create the right conditions for the development of fungi.

2. Blockage of Drainage System

  • The AC system creates condensation, which should be drained away. In case of blockage, damage, or incorrect location of the pipe, water might accumulate near the indoor unit.
  • Water stains, dampness, peeling of paint, and musty odour are some of the signs of the issue. In case of repeated appearance of such symptoms, the drainage system will require inspection.

Also, you can read our article about mould and moisture problems in order to learn how excess moisture affects indoors.

3. High Indoor Humidity

  • High humidity can keep walls, ceilings, and other surfaces damp for longer. This increases the chance of fungal growth, especially in rooms with limited airflow.
  • Singapore's humid environment makes humidity control an important part of indoor moisture management.

4. Poor Ventilation

Limited airflow can allow moisture to remain trapped in a room. This may be more noticeable in bedrooms, storage areas, or enclosed spaces where doors and windows remain closed for long periods.

Where Can Mould Growth Appear Around an Air Conditioner?

Growth may appear on or around aircon vents, the front or sides of the indoor unit, walls below the unit, ceiling areas near the unit, drainage pipes, nearby curtains, corners with limited airflow, and damp or peeling paint.

Not all growth is immediately visible. A repeated musty odour, recurring stains, or persistent dampness can indicate a problem in a less visible area.

If you suspect hidden growth, read our article on signs of hidden mould behind walls. It explains common warning signs that may indicate a problem outside your direct view.

What Are the Risks?

The mould in the home is not only an issue of its appearance. There are individuals who will get annoyed or react in an allergic manner due to these spores that are present in the air.

The effects can be sneezing, coughing, running nose, itchy eyes, skin irritation, and difficulty in breathing for individuals who react in this manner.

To learn more about this issue, you may read our article on mould and allergies. Another problem that water damage will cause to the construction of the building is staining, peeling paint, deterioration of plaster, musty odour, and others.

How to Prevent Mould Around Air Conditioners

Prevention starts from controlling moisture and ensuring proper functioning of the cooling system.

  • Inspect Aircon Filters: Inspection and cleaning of the filters in accordance with the manufacturer's guidelines can be performed. Cleaning filters will be beneficial for providing efficient airflow.
  • Air Conditioner Maintenance: Regular maintenance of the air conditioning unit can reveal the problems concerning leakage, drainage, and airflow. If there is any unusual odor, leakage, or moisture, then air conditioning inspection should be arranged.
  • Inspection for Leakage: It is necessary to inspect the surroundings of the device to ensure that there are no droplets, spots, staining, peeling paint, moist places, and musty odor. In case there is any leakage, the source should be found.
  • Increasing the Airflow: It is necessary to remove any obstacles for the airflow and increase the ventilation if it is required. It can be beneficial in eliminating excessive moisture.
  • Reducing Indoor Humidity: Controlling indoor humidity can reduce the moisture. Use of air conditioning and dehumidifiers can be helpful; however, it cannot serve as an alternative to solving the leakage and drainage issues.
  • Do Not Simply Paint Over Mould: Painting over visible growth may hide marks temporarily, but it does not necessarily solve the moisture problem. If the source remains, the issue can return.

Read our guide on whether you can paint over mould on walls before choosing this approach.

Can Aircon Cleaning Remove Mould?

Air conditioner cleaning will help eliminate the dust and dirt buildup on appropriate components of the system, but it will not solve the problem of mould growth occurring near walls, ceiling, and other building materials. It all depends on where the growth occurs and the reason for moisture. The clogged drain must be fixed. The wall or ceiling affected by moisture should also be checked.

When Should You Get a Professional Mould Inspection?

In case mould growth recurs after cleaning, if mould growth is spreading, there are mould spots on the AC unit but no apparent source of contamination, there is an ongoing musty odour, the walls or ceiling are wet, there was some water leakage, there are signs of potential mould growth, or if the affected area is hard to reach, a mould inspection can be considered.

Such an inspection will be useful in determining the extent of mould growth and the sources of moisture before choosing the appropriate treatment. In case there is mould recurrence in other areas of the house, a mould inspection may be useful in determining the extent of the mould issues.

Professional Mould Removal for Aircon-Related Problems

If growth keeps returning, treating only visible spots may not provide a lasting solution. The moisture source should be identified and the affected area assessed. The Mouldmen provides professional mould removal and remediation services for residential and commercial properties. You can learn more about the mould removal process and the steps involved in professional treatment.

For homes, our residential mould removal service can help address affected areas and recurring moisture-related concerns. Businesses can also explore our commercial mould remediation service for workplace and commercial property requirements.

Final Thoughts

The mould has formed due to moisture such as condensation, poor drainage, high humidity, and lack of adequate airflow in the air conditioner. To avoid cases like this in the future, you need to make sure that you maintain your air conditioning unit properly, keep the filter clean, vent it, control the moisture level, and attend to any leakages. In case the problem still persists, then it’s time to call for help from professionals. Contact us today at The Mouldmen if you have a recurring mould problem or moisture near your air conditioner. 

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