If your air conditioning is blowing musty-smelling air, struggling with airflow, or you’ve noticed damp patches near the indoor unit, a deep clean is likely overdue. Here’s how to spot the signs before they become a bigger problem.
Why Mould Builds Up Inside Air Conditioning Units
Air conditioning units naturally produce condensation as they cool the air. Without regular cleaning, that moisture combined with dust and debris creates exactly the damp, dark environment mould needs to grow — usually inside the unit, out of sight, until it starts affecting air quality or airflow.
Signs You Need a Deep Clean, Not Just a Filter Wash
- A musty or damp smell when the system switches on
- Noticeably weaker airflow than when the system was new
- Visible dark spots or staining around the indoor unit
- Increased dust settling near vents
- Anyone in the household experiencing more allergy symptoms indoors
Why This Matters Beyond Comfort
Beyond the unpleasant smell and reduced performance, mould inside an air conditioning unit gets actively circulated through your home every time the system runs — a genuine air quality and health consideration, not just a maintenance inconvenience.
How Often a Deep Clean Is Actually Needed
Beyond routine annual servicing, a proper deep clean — addressing the coils, drainage, and internal components rather than just the external filter — is typically recommended every 12-24 months depending on usage, or sooner if any of the signs above show up.