Who is responsible for mold in my rental AC vent?« Back to Previous Page

Under Dubai rental law, the landlord is generally responsible for maintaining the property's structure and essential services, which includes the AC ductwork and vents. The AC unit itself is often the tenant's responsibility if it's a standalone unit, but the building's ductwork is part of the property.

Your situation is a common Dubai dispute. The damp odor and black spots on duct insulation are classic signs of condensation buildup within the ducts, often worsened by our high humidity and constant AC use. The AC company is correct that the unit can be functioning perfectly while moisture from the air condenses on cold duct surfaces, especially if the insulation is compromised. However, a leak from the building envelope could also be the source.

For a rental, you must formally notify your landlord in writing (email is best) about the potential mold and request a professional inspection to identify the moisture source. They are obligated to address habitability issues. Do not attempt to clean it yourself, as disturbing it can spread spores.

The inspection should determine the moisture source—whether it's internal condensation or an external leak. If it's a building envelope issue, the landlord must fix it. For condensation, solutions may include sealing and reinsulating ducts or adjusting the AC system to reduce humidity. A proper remediation involves removing the contaminated insulation, treating the duct, and replacing the material.

Since visual identification is unreliable, a lab test is the only way to confirm if it is Stachybotrys (true "black mold") or a less hazardous species. This evidence is crucial for justifying the remediation scope to your landlord.