Step-by-Step Guide
- 1
Optimise the thermostat setting
Setting the temperature to 24–26°C for cooling and 20–22°C for heating can significantly reduce energy use. Each 1°C reduction in the cooling set point can save approximately 6–8% in energy consumption.
- 2
Use sleep and timer modes
Most ACs include a sleep mode and a timer. Sleep mode gradually adjusts the temperature overnight; the timer can turn the unit off during unoccupied hours.
- 3
Keep the filters clean
Dirty filters force the unit to work harder, consuming more energy. Regular filter cleaning improves efficiency and reduces running costs.
- 4
Keep doors and windows closed
While the AC is running, keep doors and windows closed to prevent cool or warm air from escaping. Using blinds or curtains on sun-facing windows reduces the cooling load.
- 5
Keep airflow unobstructed
Do not place furniture or curtains directly in front of the indoor unit. If air cannot circulate freely, the unit runs longer to reach the set temperature.
- 6
Use energy-saving or ECO mode
Many ACs include an ECO or energy-saving mode. In this mode, once the target temperature is reached, the compressor runs at reduced capacity, lowering energy use.
Frequently Asked Questions
Is it more efficient to turn the AC off or leave it running?
For short absences (under 30 minutes), leaving it running is generally more efficient. For longer periods, turning it off saves energy. Modern inverter ACs do not draw extra power at startup, so frequent switching is not necessary.
Do inverter ACs really save energy?
Inverter technology adjusts the compressor speed to match demand, which can reduce energy consumption by 20–40% compared to on/off models over time.
How many watts does an AC use in hot weather?
Power consumption varies widely by model and capacity. Your unit's energy label or user manual is the most reliable source. A+++ rated models typically consume significantly less than lower-rated models of similar capacity.