⚠️ AC Musty Smell? (416) 424-4328 — HVAC IAQ Experts Scarborough
Air Conditioner Smells Musty — Why It Happens and How to Fix It
Why Your AC Smells Musty
A musty smell from AC vents is almost always mould or bacteria growing on the evaporator coil or in the drain pan. The evaporator coil collects condensation in summer — that damp, dark environment is perfect for mould growth.
How to Fix Musty AC Smell
- Professional evaporator coil cleaning — The coil must be physically cleaned with appropriate coil cleaner. $250–$400.
- Condensate drain cleaning — Flush with diluted bleach or compressed air to remove mould from the drain pan and line.
- UV-C germicidal light installation — Best long-term solution. Permanently eliminates mould on coil surface. $400–$900 installed. Prevents recurrence.
- Replace filter — A clogged filter holds moisture and mould.
Why does my air conditioner smell musty in Scarborough?
A musty AC smell is caused by mould or bacteria growing on the evaporator coil or drain pan. Fix: professional coil cleaning ($250-$400), condensate drain cleaning, and a UV-C germicidal light ($400-$900) to permanently prevent mould recurrence. Call Madina Mechanical at (416) 424-4328 for AC odour diagnosis in Scarborough.
