How to find the source of mold near an AC vent?« Back to Previous Page

The moisture source is likely condensation or a hidden leak, not the AC itself. In Dubai's climate, interior walls can sweat from the temperature differential between cooled indoor air and the hot external structure. The vent above may be blowing cold air directly onto that wall corner, creating a persistent cold spot where humidity from the air condenses.

First, check for a leaking pipe or drainage issue. Feel the wall and floor for dampness. Inspect the ceiling above for any stains. Wipe the condensation point dry and tape a piece of aluminum foil tightly over the moldy area. Check it after 24 hours; moisture on the outer foil side indicates high room humidity, while moisture trapped behind it points to condensation from the wall itself.

For a proper inspection, a professional uses a borescope to look inside the wall cavity and a moisture meter to quantify the dampness in building materials. This identifies the exact source and maps the full extent, as mold behind drywall is a common issue here. DIY cleaning is not advised for recurring or wall-penetrating mold. A certified inspector can provide a lab analysis to identify the species and a protocol for remediation that addresses the root moisture problem to prevent regrowth.