How to professionally clean AC to prevent mold for good?« Back to Previous Page

The damp smell and black spots indicate microbial growth inside the AC unit, a common issue in Dubai's humid climate where condensation constantly feeds mold in the system. Simply cleaning filters isn't enough, as the growth is inside the evaporator coil and drip pan.

For a lasting solution, you need a comprehensive internal cleaning. Avoid companies that only offer a basic spray-and-wipe; this is a mechanical cleaning job. The proper process involves applying a non-toxic, EPA-approved biocidal foam to the evaporator coil and drain pan. This foam expands to contact all surfaces, killing the established growth. After dwell time, the unit is pressure-rinsed to physically remove the dead biomass and any sludge clogging the drain line, which is the core of the moisture problem.

The key to prevention is ensuring the drain line has a proper slope and is completely clear so condensation can flow out, not sit stagnant. After a professional cleaning, the technician should verify the drain is flowing freely. For high-rises in areas like the Marina with high humidity, an annual professional deep clean is recommended to manage the constant moisture.

If the issue recurs quickly after a thorough cleaning, a professional inspection is warranted. They can use a borescope to check for issues like a poorly insulated drain pan causing condensation on the outside, or assess if the unit is oversized and cycling too quickly to properly dehumidify. In some cases, adding a UV-C light inside the unit can help suppress microbial regrowth between cleanings.