HVAC Optimization for Mould Prevention in Tropical Climates: A Singapore Study
12-month study identifies optimal air conditioning settings and maintenance protocols for mould prevention in Singapore homes.
Pico X Health Research•April 2024•14 min read
Quick Answer
A 12-month Singapore study of aircon settings found the largest single mould-prevention factor was a dry-down cycle: running fan-only for 15–20 minutes before shutdown so the evaporator coil is not left wet. Holding 24–26°C rather than very low set points reduced condensation on surrounding surfaces, and quarterly deep hygiene servicing outperformed annual servicing in units used nightly. Filter cleaning alone had almost no measurable effect on mould.
This 12-month study evaluated HVAC settings and maintenance protocols across 120 Singapore residential units to identify optimal configurations for mould prevention. Temperature differentials exceeding 8°C between indoor and outdoor increased mould risk by 340% due to condensation formation. Optimal settings identified: 24-26°C with regular 3-month filter changes and coil cleaning.
Key Findings
Temperature Settings
Temperature Setting
Mould Risk
Energy Cost
Below 22°C
High (340% increase)
Very High
22-24°C
Moderate (120% increase)
High
24-26°C (Optimal)
Low (baseline)
Moderate
Above 26°C
Low
Low
Condensation Risk Factors
Temperature differential >8°C from outdoor: 340% higher mould risk
AC running continuously 24 hours: 180% higher risk vs. 8-12 hour operation
Poor duct insulation: 420% higher condensation on surfaces