AC mold in rental: DIY fix or call professional?« Back to Previous Page

That black patch behind your AC is a serious red flag, not just a surface stain. In Dubai's high humidity, an AC leak inside a wall creates a perfect hidden reservoir for mould growth, and what you see is likely a small part of the problem.

For a rental, your first step is immediate written notification to your landlord or property management company with photos. This documents the issue for your deposit and makes it their responsibility to fix the source and remediate the damage. Do not attempt a major DIY fix, as you could be held liable for improper handling.

Surface cleaning with vinegar or bleach is ineffective for mould caused by a chronic water leak. It will temporarily bleach the visible growth but won't address the mould penetrating the wallpaper, drywall, and insulation behind it. The leak must be stopped first, or the mould will return quickly.

Professional remediation is strongly advised here. The cost is not just for wiping a wall; it involves isolating the area, safely removing contaminated porous materials like drywall and insulation, HEPA vacuuming, and antimicrobial treatment. For a leak of this nature, the final price is driven by the extent of hidden damage found once the wall is opened. Expect a qualified provider to include diagnostic moisture mapping to determine the full scope.

Given the potential health implications from persistent indoor mould and the tenancy regulations, a professional assessment is the only way to guarantee the problem is solved correctly and your deposit is protected.