TL;DR — Quick Answer
- Set your thermostat to 25°C — the NEA-recommended temperature for Singapore homes.
- Clean your filter every 3 to 4 weeks. A dirty filter increases energy consumption by up to 15%.
- Use the timer to avoid running the unit all night unnecessarily.
- Keep the aircon well-serviced — a poorly maintained unit works harder and costs more to run.
- Close doors and seal gaps to stop cool air escaping.
Aircon is unavoidable in Singapore. But for most households, it is also the single biggest driver of the monthly electricity bill — accounting for anywhere from 25 to 40% of total consumption according to the National Environment Agency.
The good news is that small, practical changes make a meaningful difference. Here are five that actually work.
1 Set Your Thermostat to 25°C
This is the single most impactful thing most people can do. The NEA recommends setting the aircon to 25 degrees Celsius for Singapore homes. Many people habitually set it to 22 or even 18°C out of habit or because the room feels stuffy — but each degree lower increases energy consumption by roughly 3 to 5%.
The difference between running at 22°C and 25°C works out to a 9 to 15% reduction in energy use. For a household running two units 8 hours a night, that is a real, measurable saving every month. If 25°C feels too warm initially, try 24°C and give your body a week to adjust — most people find they sleep just as well.
💡 Use the Fan + Cool Combination
Run the aircon on Cool mode to bring the room temperature down, then switch to Fan mode once it reaches a comfortable level. The fan maintains airflow and comfort while the compressor rests — using a fraction of the electricity. This works especially well for sleeping.
2 Clean Your Filter Every 3 to 4 Weeks
A clogged air filter restricts airflow, which forces the unit to work harder to push the same amount of cool air through. Studies consistently show that a dirty filter can increase energy consumption by 10 to 15% compared to a clean one.
Cleaning the filter is a simple DIY task: open the front panel, remove the filter, rinse it under running water, let it dry fully, and reinstall. In Singapore's dusty urban environment, once every 3 to 4 weeks is the right frequency for most homes. Set a phone reminder and make it a habit.
3 Use the Timer Function Properly
Almost every modern aircon has a timer function, and it is one of the most underused features in Singapore homes. Instead of running the aircon the entire night, set it to switch off 2 to 3 hours after you fall asleep. Most people sleep comfortably through the rest of the night in a pre-cooled room.
Alternatively, use the sleep mode or auto-off feature if your unit has one — these automatically raise the set temperature slightly after a set time, reducing consumption without waking you up.
If you are unsure how to set the timer on your specific unit, WhatsApp our team — we are happy to walk you through it.
4 Keep the Unit Well Serviced
A well-maintained aircon runs more efficiently than a neglected one. When the evaporator coils are coated in dust and the drainage is partially blocked, the system has to work significantly harder to achieve the same result — and that extra effort shows up on your electricity bill.
Scheduling a professional general service every 3 months keeps the unit operating at peak efficiency. A chemical overhaul once a year restores units that have started to degrade despite regular servicing. Think of it as routine maintenance — the cost of servicing is always less than the cost of the extra electricity you would otherwise consume.
5 Seal the Room and Reduce Heat Load
An aircon cooling an open room or a room full of heat sources has to work much harder. Small adjustments that reduce heat load can meaningfully improve efficiency:
- Close doors and windows: This sounds obvious but is frequently overlooked, especially in HDB units with shared corridors.
- Draw curtains or blinds during the day: Sunlight through glass is a significant source of radiant heat. Blocking direct sun can reduce the cooling load substantially in west-facing rooms.
- Turn off heat-generating appliances: Computers, televisions, and cooking appliances all add heat to a room. Turning them off when not in use reduces the load on your aircon.
- Check for air leaks: Gaps under doors or around window frames allow cool air to escape and warm air to enter. A simple door draught stopper is a cheap and effective fix.
"The customers who complain most about high electricity bills are almost always the ones with dirty units running at 20°C in a room where the door is left open. Fix those two things first — the savings are immediate."
When to Consider Upgrading
If your aircon is more than 10 years old, the efficiency gains from all the tips above may be limited by the unit's inherently lower energy rating. Older non-inverter units consume significantly more electricity than modern inverter-technology equivalents.
If you are spending $80 or more per month on electricity just from aircon usage, it may be worth considering a newer, higher-rated unit. The energy savings over 5 years often offset the cost of replacement. See our new installation page for guidance on choosing the right system.