How to remove black mold from AC condensation and prevent it?« Back to Previous Page

The black patches are a common issue here, caused by the AC's condensation mixing with airborne dust and mold spores in our humid climate. For a small patch, you can clean it yourself with a solution of white vinegar and water or a dedicated mold remover, wearing an N95 mask and gloves. Never use bleach, as it only removes the colour and can push spores deeper into porous surfaces like wood or drywall.

However, if the mould is widespread, has a musty odour, or is on porous materials, professional assessment is strongly recommended. The root cause is the AC leak and resulting dampness, which must be fixed first. A persistent leak indicates a blocked drain line or improper unit levelling, common problems when units run year-round.

To prevent recurrence, first have an HVAC technician fix the leak and ensure the condensate drain line is clear. Then, improve air circulation in the room; even a small fan can help. Keep the AC set to a moderate temperature, as excessively cold settings cause more condensation. For high-humidity periods, using a standalone dehumidifier in conjunction with your AC can help maintain a drier environment and prevent the conditions mould needs to grow.