What is the main cause of mould in Singapore.

2月 12 2025
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How Air Conditioning Affects Mould Growth in HDBs and Condominiums in Singapore

Singapore’s hot and humid climate makes air conditioning a necessity in most households, particularly in high-rise HDB flats and private condominiums. However, prolonged and improper use of air conditioning can contribute to mould growth, which poses health risks and damages indoor spaces. Understanding how air conditioning affects mould development and implementing preventive measures can help homeowners maintain a healthy indoor environment.

1. The Link Between Air Conditioning and Mould Growth

a. Condensation in Aircon Trunking – The Primary Cause

Studies show that 60% of mould issues in Singaporean homes originate from condensation in aircon trunking. When warm, humid air meets the cold surfaces of aircon pipes running through trunking, condensation forms, creating a damp environment inside the trunking casing. Over time, this trapped moisture fosters mould growth, which can spread to adjacent walls, ceilings, and even furniture.

b. Poor Air Circulation and Stagnant Humidity

Air conditioning systems recirculate air within a room, but if there is inadequate ventilation or an imbalanced air distribution, certain areas may trap excess humidity. This is especially common in bedrooms and living spaces with blocked air vents or tightly sealed windows, leading to mould growth on walls, ceilings, and behind furniture.

c. Dirty Air Filters and Mould Spores Circulation

Neglected air conditioner filters can become a breeding ground for mould spores. When an air conditioner is running with a clogged filter, it may spread mould spores throughout the home, accelerating the growth of mould colonies in other damp areas.

d. Inadequate Drainage and Water Accumulation

All air conditioning units produce condensation that needs to be drained properly. If the drainage system is clogged or poorly maintained, water can accumulate inside the unit or drip onto the surrounding areas, promoting mould growth near the aircon vents and walls.

2. Common Areas Affected by Air Conditioning-Induced Mould

Aircon Trunking and Surrounding Walls: The most common site for mould formation due to trapped condensation inside the casing.
Ceilings and Walls Near Air Vents: Cold air constantly blowing onto certain surfaces can lead to condensation, causing moisture buildup.
Behind Furniture: Large furniture pieces close to air-conditioned walls may trap moisture, creating hidden mould growth spots.
Curtains and Carpets: Fabric materials absorb humidity and are susceptible to mould spores spreading through the air.
Inside Air Conditioner Units: Mould can develop inside the evaporator coils, filters, and ducts, circulating spores when the aircon is turned on.

3. How to Prevent Mould Growth from Air Conditioning

a. Address Condensation in Aircon Trunking

Use high-quality insulation around aircon pipes to reduce condensation buildup.
Ensure that trunking is properly sealed to prevent humid air from entering and creating a moist environment inside.
Periodically check and dry trunking areas, especially in older installations where insulation may have deteriorated.

b. Maintain Optimal Temperature and Humidity Levels

Set your air conditioner between 23°C and 25°C to prevent excessive temperature differences that cause condensation.
Use a dehumidifier or aircon dry mode to keep indoor humidity below 60%, reducing the chances of mould formation.

c. Ensure Proper Ventilation

Open windows or use exhaust fans periodically to allow fresh air circulation.
Avoid sealing up rooms entirely with no airflow, as stagnant air promotes mould growth.

d. Regular Cleaning and Maintenance

Clean air filters every two weeks to prevent dust and mould accumulation.
Schedule professional servicing every six months to check for water leakage, clogged drainage, and mould inside the unit.
Wipe down aircon vents with antimould treatments to prevent spores from settling.

e. Improve Indoor Air Quality

Use air purifiers with HEPA filters to capture airborne mould spores.
Install mould-resistant coatings on ceilings and walls to reduce surface mould growth.

f. Address Water Leakage Immediately

Inspect and fix any aircon drainage issues to prevent water from dripping onto ceilings or walls.
If condensation forms on aircon pipes, apply pipe insulation to prevent moisture buildup.

4. When to Seek Professional Mould Remediation

If mould has already developed in your home due to air conditioning issues, professional intervention may be necessary. Pico X Health, a leader in mould removal and indoor air quality solutions in Singapore, provides comprehensive treatments to eliminate mould and prevent future occurrences. Our services include:

Advanced antimould coatings for long-term protection
Deep cleaning and disinfection of aircon units and indoor surfaces
Eco-friendly air purification solutions to improve overall air quality

By addressing air conditioning-related mould issues proactively, homeowners can enjoy a cleaner, healthier, and mould-free living environment.

Conclusion

While air conditioning is essential for comfort in Singapore’s humid climate, improper use and maintenance can contribute to mould problems in HDBs and condominiums. With 60% of mould issues originating from condensation in aircon trunking, homeowners must take proactive steps such as proper insulation, ventilation, and routine servicing to prevent moisture buildup. For expert solutions, Pico X Health offers effective mould prevention and removal services to keep your indoor spaces safe and breathable.