AC leak causing black mold—is this a major, expensive fix?« Back to Previous Page

This is a common issue in Dubai's climate, where high humidity and constant AC use create perfect conditions for mold. The black spots spreading from an AC leak are almost certainly mold, and it indicates two separate problems that need to be addressed: the moisture source and the biological growth itself.

The cost and scale depend entirely on the extent of the water damage behind the wardrobe. A small, surface-level patch may be a straightforward cleanup. However, if the leak has been ongoing and the drywall or backing board is saturated, the wall itself will likely need to be opened up, dried, and sections replaced to prevent the mold from returning. This moves it from a simple cleaning job to a remediation and repair project.

You must first fix the AC leak. A certified HVAC technician needs to identify the source—often a clogged condensate drain line—and repair it. Until that moisture source is stopped, any cleaning will be temporary. For the mold, a professional inspection is recommended to assess the penetration depth into the wall. Surface mold on a non-porous surface can sometimes be cleaned, but mold on porous materials like drywall usually requires cutting out and replacing the affected section.

The overall cost is determined by the repair work, not just the cleaning. You will need two professionals: an AC technician to stop the leak and a remediation team to handle the wall. For a situation involving structural materials, it is a significant job that requires a professional assessment to get an accurate scope and cost. Request an on-site inspection to determine if the wall cavity is affected.