How to Clean Your Aircon at Home, and When to Call a Professional
- ๐ Updated 27 October 2026
- โ๏ธ By City Cooling Management
- ๐ท Aircon Maintenance ยท Aircon Servicing
You can clean your aircon’s washable filters and wipe down the front panel yourself. Anything inside the unit, including the coil, blower, drain pipe, refrigerant and wiring, and anything on the aircon ledge, is a job for a technician. City Cooling’s BCA-certified technicians service HDB flats, condos and landed homes across Singapore, and this guide sets out where that line falls: how to clean a filter step by step, what you should never attempt, and when DIY stops being enough.
Can you service your aircon yourself?
You can clean your aircon, but you cannot service it yourself. Cleaning means looking after the parts you can reach without tools: the washable filter and the outer casing. Servicing goes further. It covers cleaning the evaporator coil, flushing the drain pipe, checking the gas level and testing the electrical parts, all of which sit inside the unit.
The difference matters because the parts you can reach are not the parts that cause most breakdowns. A clean filter keeps air moving and helps the unit run efficiently, but it does nothing for a blocked drain pipe, a dirty coil or a refrigerant leak. Those need the tools, training and access that come with a professional service.
So the sensible split is simple. Clean the filters yourself between visits, and book City Cooling servicing for everything else.
Learn more:ย Qualities of a Good Aircon Servicing Company
What parts of an aircon can you safely clean at home?
At home, you can safely clean the washable air filter, wipe the front panel and vents, and dust around the unit. Everything behind the filter, plus the outdoor condenser, should be left to a City Cooling technician or another trained professional. The table below shows where each part falls.
| Safe to clean yourself | Leave to a technician |
|---|---|
| Washable air filter | Evaporator coil |
| Front panel and louvres (damp cloth, unit switched off) | Blower wheel (the fan behind the louvres) |
| Dust on and around the casing | Drain pan and drain pipe |
| Outdoor condenser and anything on the aircon ledge | |
| Refrigerant pipes and wiring |
Before you start, check your unit’s manual. Many split units have a washable mesh filter, but some also carry a separate deodorising or fine-particle insert that should not be washed. If you are unsure which is which, leave the insert in place and ask the technician at your next service.
How do you clean an aircon filter step by step?
To clean an aircon filter, switch off and isolate the power, open the front panel, lift the filter out, check it for damage, wash it the way your manual allows, let it dry fully, then refit it and test the unit. City Cooling technicians wrote these steps for wall-mounted split units, which most Singapore homes use.
1. Switch off and isolate the power
Turn the aircon off with the remote, then switch it off at the isolator switch near the unit. The remote on its own only puts the unit on standby. Keep your hands dry, and do not touch any wiring you can see once the panel is open.
2. Open the front panel and lift the filter out
Lift the front panel from both sides until it stays in its open position. The filter sits just behind it. Slide or unclip it gently as your manual shows, and never force a clip. A quick photo helps you put it back the same way.
3. Check the filter for damage
Look for tears in the mesh or a bent frame. Cleaning will not fix either, and a damaged filter lets dust straight through to the coil. If the filter is damaged, order the correct replacement for your model instead of washing it.
4. Wash it the way your manual allows
Take the filter to a sink or bathroom, away from the unit. Rinse it gently, or vacuum it first if it is heavily dusty. Use detergent only if your manual permits it. Never use a pressure jet, which can tear the mesh.
5. Let it dry fully
Leave the filter to dry completely in a clean, shaded spot. Do not use a hairdryer or direct sun to speed things up. Refitting a damp filter traps moisture inside the unit, and moisture is what mould needs to grow.
6. Refit, close and test
Slide the dry filter back into place, close the front panel firmly, restore the power and switch the unit on. If you hear a new noise, see a warning light or the panel will not close properly, switch off and book a check.
What should you never do yourself?
Never handle refrigerant, open the casing, spray liquids into the unit, work on the drain pipe or wiring, or go near the aircon ledge. These jobs carry a risk of electric shock, refrigerant exposure, water damage or a fall, and each one needs a trained technician like the City Cooling team.
- Topping up or handling refrigerant. Gas work needs certified technicians and the right tools, and R32, the refrigerant used in many newer units, is mildly flammable.
- Opening the casing to reach the coil or blower. The coil fins bend easily, and the electrical parts sit close by.
- Spraying water or chemicals into the unit. Liquid can reach the electronics and overflow the drain tray.
- Clearing the drain pipe with wires, brushes or chemicals. You can push a blockage further in or crack the pipe. If water is dripping, see our guide to aircon leaking water.
- Touching wiring, or resetting a breaker that keeps tripping. Switch the aircon off at its isolator and call a technician.
- Climbing onto the aircon ledge or leaning out of a window to reach the condenser. Book condenser cleaning instead.
If a problem goes beyond the filter, book a check and describe what you have noticed. That tells the technician where to start.
How often should you clean your aircon filter?
City Cooling recommends cleaning your aircon filters every two to three weeks, as set out in our HDB aircon servicing guide. If your unit’s manual gives a different interval, follow the manual, because filter designs vary between brands and models.
Check the filter sooner if:
- the aircon runs for long hours every day
- you can see a grey layer of dust on the mesh
- the airflow feels weaker than usual
- you notice a new smell when the unit starts
Haze periods and renovation work nearby put extra dust into the air, so check the filter during those weeks as well, even if your usual cleaning day has not come round yet.
Filter cleaning works alongside professional servicing and does not replace it. For how often to book a full service, see our complete aircon servicing guide.
Comment
Ops! No feedback yet!
Be the first to share your experience!
Share Your Experience
Your feedback helps others make informed decisions.
