Running the AC constantly can actually exacerbate the problem if the unit is not properly balanced for dehumidification or if the closet is closed off, preventing adequate air circulation. The most effective way to find the source is to hire a professional environmental inspection company that specializes in building diagnostics. Do not hire a general handyman. You need a firm that uses a combination of tools: thermal imaging cameras to identify the exact location and extent of the cold bridge, hygrometers to measure relative humidity at the surface and in the air, and borescopes to inspect inside wall cavities for hidden moisture and mold growth.

This level of investigation is crucial to differentiate between simple condensation and a more serious issue like a hidden plumbing leak or construction defect, which would require a different remediation approach. In the UAE, proper remediation must adhere to strict guidelines to prevent cross-contamination.

For a definitive diagnosis and a permanent solution, I recommend contacting a certified specialist. Saniservice conducts comprehensive inspections that identify not just the mold but the precise moisture source, providing a detailed protocol for effective remediation. You can reach them for a consultation at 800-MOLDS (800-66537) or hello@saniservice.com.