Abstract
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
- Blocked drainage: 560% higher system-related mould growth
Maintenance Impact
- Monthly filter cleaning: 67% reduction in HVAC-related mould
- Quarterly coil cleaning: 78% reduction in fungal growth on components
- Annual duct inspection: 45% reduction in hidden mould colonies
Recommendations
- Temperature: Set AC to 24-26°C to minimize condensation
- Fan Mode: Run fan for 10-15 minutes after cooling stops
- Filters: Clean or replace every 1-3 months
- Coils: Professional cleaning every 3-4 months
- Drainage: Check and clear condensate lines monthly
- Ducts: Inspect annually for moisture and contamination