AC mold behind unit: professional needed and cost?« Back to Previous Page

Yes, this absolutely requires a professional mold remediation company. Bleach is ineffective on porous surfaces like drywall and wallpaper; it only bleaches the surface colour while the root structure thrives on the moisture left behind, which is why it returned worse.

The leak from your AC is the primary issue, likely caused by a blocked condensate drain line—a very common problem in Dubai's climate where ACs run constantly. This continuous supply of moisture allows mold to spread deep into the wall cavity, which you cannot see. Remediation involves stopping the leak at its source, then containing and removing the contaminated building materials.

For a single wall, the scope of work is typically smaller but must follow a strict protocol: isolating the area to prevent spore spread, removing the affected wallpaper and potentially the underlying gypsum board if the mold has penetrated, HEPA vacuuming, and applying antimicrobial treatments. The final, critical step is a clearance test to confirm the spore count has returned to a normal level.

Cost is variable and not something you should estimate over a forum. It depends entirely on the extent of the hidden damage, the materials affected, and the required containment measures. Reputable companies provide a detailed, no-obligation assessment and quote only after a proper inspection. Always request this and ensure their quote includes both the remediation work and the post-clearance verification testing.