How often should I clean my aircon filter?

Check it periodically between services. In Singapore's dusty environment, filters often need cleaning more frequently than the service interval. If it looks dirty, rinse it. Do not wait for a scheduled visit.

Can I run my aircon without a filter?

We advise against it. Without the filter, dust goes directly onto the coil. A few weeks without a filter builds up dust. That buildup needs a chemical wash, which takes longer and costs more than a filter clean.

What if my filter has a strange smell after cleaning?

A musty smell after cleaning usually means mould has grown in the filter material or on the coil behind it. Rinsing the filter removes surface dust but not mould. If the smell persists, the coil needs to be inspected and likely chemically washed.

Are aftermarket replacement filters good enough?

For most units, yes — as long as the fit is correct and the mesh grade is similar. A filter that does not fit properly lets air bypass it at the edges, which defeats the purpose. Bring the original filter dimensions when purchasing a replacement.

Aircon filter

The air filter is the most accessible part of your aircon — and the most commonly neglected. A blocked filter is behind a significant share of weak cooling and water leak complaints. Checking it takes under a minute.

Parts summary

PartAir Filter

LocationFront of the indoor unit, easy to see

FunctionCatches dust before it reaches the coil

ImportanceProtects coil and keeps airflow strong

Warning Signs

Weak airflow from the indoor unit
Room takes longer to reach set temperature
Visibly dirty filter when you look at it

What it is and where it sits

The air filter is a mesh screen at the front of your indoor unit. It catches dust, hair, and particles from room air.

Think of it like a window screen. It lets air through but blocks dirt.

Without the filter, dust would clog the cooling coil and be very expensive to clean.

Failure modes and warning signs

Filters collect dust and dirt from room air. Over time they become clogged and restrict airflow.

You notice weak airflow from the indoor unit. The fan runs but output is reduced. Your room takes longer to cool.

You can see if the filter is dirty. Look at the front of the indoor unit. If the mesh is grey or dark, it needs cleaning.

Weak airflow from the indoor unit
Room takes longer to reach set temperature
Visibly dirty filter when you look at it

How we verify the problem

Technicians inspect and clean the filter during every service visit.

They check if the coil is also dirty. A dirty coil needs special chemical cleaning.

They test airflow after cleaning to make sure it improves.

How we verify the problem summary table
Test Finding	What It Means	Next Step
Filter is blocked	Dust is stopping airflow	Clean or replace the filter
Filter clean but airflow still weak	Coil is also dirty	Do professional coil clean
Filter clean but cooling is weak	Refrigerant or motor issue	Check refrigerant and fan

Should you fix it now?

Clean or replace the filter if it is visibly dirty and airflow is weak.

You can wait if the filter looks light grey and airflow is normal.

Do not wait if the filter is very dark and blocking airflow. Weak airflow stresses the whole system.

What to expect

Cleaning the filter yourself takes under a minute and costs nothing.

A blocked filter is the most common cause of weak cooling complaints.

Regular filter checks prevent expensive coil cleaning later.

Common questions

Same situation with your aircon?

Describe what's happening. We'll work out the likely cause and tell you the right next step.

Describe it on WhatsApp

Aircon not cold

Symptoms

Dripping after filter cleaning traced to drain-trap seal loss

Cases

How to clean your aircon filter yourself in Singapore

Knowledge

Aircon leaking water indoors