DIY mold removal or professional help for AC unit?« Back to Previous Page

Based on your description, this requires professional inspection. Visible black growth inside the unit and on the wall, combined with persistent respiratory symptoms and a strong smell after a bleach attempt, indicates a significant issue that is likely beyond a surface-level DIY fix.

In Dubai's climate, AC units are a primary source of condensation and constant moisture, creating an ideal environment for mould to thrive and penetrate porous materials like drywall. The concern is that the mould you see is likely part of a larger colony growing inside the ductwork or wall cavity, which you cannot properly assess or remediate without specialized equipment. Bleach is ineffective on porous surfaces and can actually aggravate the problem by adding moisture.

A certified mould inspection involves using moisture meters and borescopes to check inside walls and air quality tests to identify spore types and concentrations. This is critical because the species (e.g., Cladosporium vs. Stachybotrys) determines the health risk and remediation protocol. For a situation involving structural elements and health symptoms, a professional assessment is the only way to verify the full extent and ensure it is resolved safely and completely, preventing recurrence.