Dropping AC from 24C to 20C may feel better for a short time, but it increases compressor work. More work means more units consumed and higher bills.
Many families lower the thermostat quickly and then keep it there for many hours. This habit is common, but expensive. A better method is to cool quickly, then hold a moderate setting.
Rule Of Thumb
- Lower setpoint = longer compressor runtime.
- Small changes can create large monthly cost differences.
- Best balance for many homes is near 24C.
Comparison Table
| Setpoint | Relative Usage | Monthly Cost Impact |
|---|---|---|
| 26C | Low | -15 to -20% |
| 24C | Balanced | Baseline |
| 22C | High | +15 to +25% |
| 20C | Very High | +30% or more |
Extra Practical Notes
Setpoint decisions should match room use. Bedrooms and living rooms often need different settings. Pairing fan airflow with a slightly higher AC setting is usually more efficient.
Track one week of usage at your current setpoint, then test a 1C increase for another week. Compare cost and comfort before deciding your long-term setting.
FAQs
What is a safe savings setpoint?
24C is a practical target for many households.
Can fans help?
Yes. Fans improve comfort so you can keep a higher AC setpoint.
Conclusion
Track cost per degree in your home and lock a setpoint that keeps comfort high and waste low.