Where Mould Grows in Aircon Units
- Blower Wheel: Accumulated dust and moisture create ideal conditions
- Evaporator Coils: Condensation provides constant moisture
- Drain Pan: Standing water if drain is slow or blocked
- Air Filters: Trapped dust and moisture
- Ductwork: For centralized systems, hidden mould growth
Signs of Aircon Mould
- Musty or mouldy smell when aircon runs
- Visible black spots on vents or blades
- Respiratory symptoms when in air-conditioned room
- Allergies or headaches that improve when outside
- Reduced airflow or cooling efficiency
Prevention Tips
- Service aircon every 3 months
- Annual chemical wash for thorough cleaning
- Set temperature to 23-25°C (not too cold)
- Run aircon in dry/dehumidify mode occasionally
- Ensure proper condensate drainage
- Clean or replace filters monthly
- Keep room ventilated when aircon is off
Frequently Asked Questions
Why does my aircon smell musty?
Musty aircon smell usually indicates mould growth inside the unit. Mould grows on the blower wheel, evaporator coils, or drain pan where moisture collects. Regular servicing is essential to prevent this.
How often should I service my aircon to prevent mould?
In Singapore, service aircon every 3 months for residential use. More frequent servicing (monthly) for units running 12+ hours daily. Annual chemical wash or overhaul is recommended for thorough cleaning.
Can aircon mould make you sick?
Yes, aircon with mould blows spores directly into your room and breathing zone. This can cause respiratory issues, allergies, headaches, and worsen asthma. Children and elderly are especially vulnerable.
What temperature should I set to prevent mould?
Setting aircon between 23-25°C is optimal. Extremely low temperatures (18-20°C) cause more condensation and can create cold spots on walls where mould grows. Moderate cooling with good airflow is best.