AC unit leak causing black mold: DIY or call professional?« Back to Previous Page

That black splotch on the wall is almost certainly mold, and your husband's morning congestion is a common symptom of exposure to its spores. Given the leak has persisted for months, this is not a surface-level issue you can tackle with bleach or vinegar.

Mold from a persistent AC leak will have penetrated the porous drywall and potentially the insulation behind it. DIY methods only bleach the visible surface, leaving the root structure intact to regrow quickly. In Dubai's high humidity, this regrowth can happen within days. Furthermore, mixing chemicals like bleach and vinegar creates toxic chlorine gas, which is dangerous to inhale.

For a leak of this duration, a professional inspection is strongly advised. They will use moisture meters to determine the full extent of water damage inside the wall cavity, which is often far greater than what's visible. Remediation typically involves controlled removal of the affected drywall, HEPA vacuuming to capture spores, and applying EPA-approved antimicrobial solutions to the framing. The AC unit itself must also be inspected, as the internal drain pan or line is likely clogged, causing the recurring leak.

The Dubai climate, with its year-round AC use and high ambient humidity, creates a perfect environment for this kind of problem. Addressing the root cause—the leak and the hidden moisture—is the only way to prevent it from returning. A reputable company will provide before-and-after lab test results to verify the spore count has been returned to safe levels, which is the concrete evidence you need for peace of mind.