An aircon filter collects dust, hair, and other airborne particles before they reach the cooling coil. Over time, the filter becomes dirty or damaged. This restricts airflow and can affect your air conditioner’s cooling performance.
Regular cleaning is normally enough for reusable mesh filters. However, an aircon filter replacement may be necessary when the filter is torn, badly stained, deformed or no longer fits correctly.
Replacing a damaged filter can help improve airflow, reduce dust circulation and protect the internal components of your air conditioner.
What Does an Aircon Filter Do?
The filter is positioned behind the front cover of the indoor fan coil unit. Air from the room passes through this filter before reaching the evaporator coil.
Its main purposes are to:
- Capture dust, hair and larger airborne particles
- Reduce dirt accumulation inside the fan coil
- Maintain smooth airflow
- Protect the cooling coil and blower
- Support cleaner indoor air
A standard mesh filter does not remove every microscopic pollutant. However, keeping it clean and undamaged is still an important part of regular aircon servicing in Singapore.
When Should You Replace an Aircon Filter?
Many wall-mounted split air conditioners use washable filters that can last for several years. Therefore, you do not need to replace the filter every time it becomes dusty.
Replacement should be considered when cleaning can no longer restore its condition.
1. The filter is torn or damaged
Small holes allow dust to pass through and collect on the evaporator coil and blower. Replace a torn filter instead of continuing to wash and reuse it.
2. The frame is bent or deformed
A distorted frame may not sit correctly inside the fan coil. Gaps around the filter allow unfiltered air to enter the unit.
3. Dirt remains after washing
Old filters can develop stubborn stains, grease or embedded dirt that normal washing cannot remove. This is common in kitchens, smoking environments and aircons that have not been maintained regularly.
4. The filter produces a persistent smell
A musty smell may remain when mould or bacteria have developed on the filter or internal components. Replacing the filter alone may not solve the issue if the coil, blower or drain tray is also contaminated.
5. Airflow remains weak
A clogged filter restricts air movement. If airflow remains weak after the filter is cleaned, the fan coil, blower or cooling coil may require professional inspection.
You can read our guide about an aircon not cooling properly to understand other possible causes.
How Often Should You Check Your Aircon Filter?
In Singapore, household air conditioners are frequently used because of the warm and humid weather. Check the filter approximately once every two to four weeks if the unit operates daily.
Cleaning frequency depends on:
- Daily operating hours
- Number of occupants
- Presence of pets
- Nearby renovation or construction work
- Smoking or cooking activities
- Indoor dust levels
Homes with pets or occupants who are sensitive to dust may need more frequent filter cleaning.
How often should the filter be replaced?
There is no fixed replacement schedule for every reusable filter. A washable mesh filter should be replaced based on its physical condition rather than age alone.
Disposable or specialised filters may have a manufacturer-recommended replacement interval. Always check the aircon manual and use a compatible filter for your model.
How to Replace an Aircon Filter Safely
Replacing a basic mesh filter is relatively straightforward, but you must follow the correct steps.
Step 1: Switch off the air conditioner
Turn off the aircon using the remote control. For additional safety, isolate the electrical supply before opening the indoor unit.
Step 2: Open the front cover
Lift the front panel carefully. Do not force it because the clips or hinges may break.
Step 3: Remove the old filter
Slide the filter out according to the manufacturer’s instructions. Take note of its direction and position.
Step 4: Check the model and filter size
Purchase an original or compatible replacement designed for the exact aircon model. An incorrectly sized filter may leave gaps or restrict airflow.
Important compatibility check
Check the model number printed on the indoor unit label. Daikin, Mitsubishi Electric, Panasonic, Midea and Mitsubishi Heavy Industries models may use filters with different sizes and mounting points.
Safety note
Do not touch electrical components, sharp metal fins or internal wiring. Contact a professional technician if the filter is difficult to remove or the front cover appears damaged.
Step 5: Install the replacement filter
Insert the new filter in the correct direction and ensure it sits firmly without gaps. Close the front panel gently and restart the unit.
Cleaning vs Replacing an Aircon Filter
| Filter condition | Recommended action |
|---|---|
| Light surface dust | Vacuum or wash the filter |
| Moderate dust buildup | Wash and dry completely |
| Torn mesh | Replace the filter |
| Bent or damaged frame | Replace the filter |
| Persistent mould or smell | Replace and inspect the fan coil |
| Weak airflow after cleaning | Arrange professional servicing |
| Dirt inside the coil and blower | Consider deep cleaning |
Filter replacement only addresses a damaged or unusable filter. If dirt has already accumulated inside the aircon, general servicing, a chemical wash or a chemical overhaul may be needed.
Our chemical wash vs chemical overhaul guide explains which cleaning option may be appropriate.
Professional Aircon Filter Replacement in Singapore
You can clean or replace a basic filter yourself if you can access it safely and have the correct replacement. However, professional assistance is recommended when the aircon has weak airflow, water leakage, abnormal noise, a bad smell or repeated cooling problems.
Letscool Aircon can inspect the filter, evaporator coil, blower, drainage system, and other internal parts. If a mechanical or electrical fault is found, our aircon repair service in Singapore can address the underlying problem.
Contact Letscool Aircon at +65 9862 3678 for aircon servicing, filter inspection or repair assistance.
Frequently Asked Questions
Can I wash my aircon filter instead of replacing it?
Yes. Most wall-mounted air conditioners use reusable mesh filters that can be washed. Replacement is usually necessary only when the filter is torn, deformed, badly stained or no longer fits correctly.
How often should I clean my aircon filter in Singapore?
Check the filter every two to four weeks if you use the aircon daily. Homes with pets, smokers or high dust levels may require more frequent cleaning.
How do I know whether my aircon filter needs replacement?
Replace the filter if it has holes, torn mesh, a damaged frame, persistent odours or dirt that cannot be removed through normal cleaning.
Which is the cheapest System 2 aircon in Singapore?
Midea System 2 is one of the most affordable options, with prices starting from $2,150 . Other choices include Panasonic (9k, 9k BTU) from $2,250, Mitsubishi Electric (9k, 9k BTU) from $2,350 and Daikin (9k, 9k BTU) from $2,480.
Can a dirty aircon filter cause the unit not to cool?
Yes. A clogged filter can restrict airflow and reduce cooling performance. However, poor cooling may also be caused by a dirty coil, refrigerant leak, fan problem or faulty component.
Can I use any replacement filter in my aircon?
No. Use an original or compatible filter designed for the exact model. An incorrectly sized filter may leave gaps, restrict airflow or fail to fit securely.
Does general aircon servicing include filter cleaning?
General servicing normally includes cleaning the reusable air filter. Replacement filters and specialised filters may be charged separately, depending on the model and filter required.