How to clean AC unit to prevent musty smell?« Back to Previous Page

The musty smell when your AC kicks on is a classic sign of mold growth inside the unit, likely on the evaporator coils or in the drip pan where condensation collects. Dubai's high humidity creates the perfect environment for this, especially during seasonal shifts.

Start by turning off the AC's power at the circuit breaker. Remove the front panel and inspect the evaporator coils and the drain pan behind it. You'll likely find a slimy, dark biofilm. Use a soft brush and a spray cleaner specifically designed for AC coils—avoid bleach or harsh household cleaners as they can damage the fins and leave toxic fumes. Thoroughly clean the accessible coils and the drain pan. Then, pour a mixture of hot water and white vinegar down the condensate drain line to clear any clogs of organic matter.

This is a surface-level cleaning. If the smell persists, the mold growth is likely deep within the ductwork or on the coil's backside, inaccessible without professional tools. In high-rises like JLT, the central AHU serving your apartment could also be the source, which is a building management issue. For a persistent problem, a professional inspection with a borescope camera is needed to assess the full system. They can perform a deeper clean with HEPA vacuuming and antimicrobial treatments that measurably reduce spore counts and prevent quick regrowth.