How to Clean Your Air Conditioner Filter
Cleaning your air conditioner filter regularly improves the AC’s performance, reduces how much energy it consumes, and extends its lifespan.
You’ll also breathe in healthier air when you’re indoors.
The cleaning process is way easier than you think. Let’s walk through it together.
Table of Contents
Do these before cleaning your AC
Safety comes first. Before going anywhere near the air conditioner filter, please turn off the AC first. If unsure of how to turn off your system, check the manufacturer manual or visit their website.
Some ACs are designed and installed so that they can be unplugged from the standard wall power point. Others are wired into a specific, dedicated circuit and are connected directly to the switchboard, so you’ll need to look for a circuit labelled “air con,” “A/C,” or something similar to turn them off. Some systems also have an isolator switch fitted near the outdoor unit. This is a separate shut-off switch that cuts off the power supply to the air conditioner.
You may need:
- A vacuum cleaner
- A soft brush or a vacuum brush attachment
- A pair of rubber cleaning gloves or disposable nitrile gloves, especially if the filter is very dusty
- Mild dish soap or mild detergent
- Lukewarm water (pour some into a plastic bucket)
- A clean towel or an old cloth for mopping up drips
- A stable stepladder, you can’t reach the filter while standing at ground level
- The manufacturer’s manual
Gather your supplies before you begin.
The manual will contain specific instructions about accessing your filter as well as any precautions you should take while cleaning and reinstalling or replacing it.
How to Clean Your AC Filter, Step by Step
You’ll need to reach the filter first. Check the front panel, grille, or filter cover. To open the front panel of a wall-mounted unit, you typically lift it upwards gently until it clicks into place.
Some panels can be flipped down or fully detached, while others may have to be unscrewed. If you’re experiencing any difficulties opening the filter access panel, pick up your manual.
After opening the front panel, look for the filter and unclip it from its position. Then slide or lift it out carefully. If it feels stuck, don’t force it. An air filter can be difficult to remove if:
- Dust has collected in the side tracks.
- Grime has built up around the filter’s plastic edges.
- The filter frame is slightly bent, or
- A clip or tab is still holding it in place.
Check the sides of the filter and the slots it sits in before trying again.
Hold the vacuum’s soft brush attachment just against the filter surface, then gently vacuum across the mesh to remove loose dust. You might cough a little if the filter is very dusty, so you may want to wear a nose mask for this step.
Rinse the filter under lukewarm running water if it’s still dirty after vacuuming. You can apply a small amount of mild dishwashing liquid to the mesh if it’s really grimy. If the air conditioner isn’t used often and you clean the filter monthly, you may not need to wash the filter every cleaning day.
Don’t use any harsh chemicals or hot water. And regardless of how much dirt has built up in the filter, don’t scrub it hard.
Leave the filter to air-dry before reinstalling it. Don’t place the filter under direct sunlight, near a heater, or in a clothes dryer to speed up the process. Let it air-dry in a shaded, well-ventilated spot.
Drying can take several hours. Please plan ahead and be patient. Putting the filter back while it’s still damp can encourage mould growth and introduce moisture into the unit, reduce the quality of conditioned air, and cause a musty smell.
Once the filter is completely dry, place it back in its original position and make sure it sits securely. Reattach or close the front panel, grille, or cover, and confirm that all clips are properly engaged before turning the air conditioner back on.
How Often Should You Clean Your Air Conditioner Filter?
As a safe routine, you should clean your air conditioner filter once every 1–3 months to keep it running efficiently.
The ideal cleaning frequency depends on:
- Manual instructions: Check the manual to find out what the manufacturer recommends. The document will also specify the filter type and whether it should be vacuumed, vacuumed and washed, or replaced.
- Usage patterns: During peak usage seasons, you may need to clean it every two weeks.
- Whether you have pets: Homes with pets usually need more frequent filter cleaning because fur, dander, and dust can collect on the filter faster.
- Your household size: A larger household can place more demand on the system, especially if the occupants use several rooms throughout the day or engage in activities that stir up dust indoors, such as cooking or DIY projects.
- Indoor and outdoor air quality: If your home is near a main road, construction site, dusty area, or smoke-prone location, the filter may clog faster. Cooking fumes and other sources of dust and smoke indoors can also make the filter dirtier between cleaning sessions.
Check your filter right away if you notice reduced airflow, visible dust buildup, unusual odours, worsening allergy symptoms, or poor cooling performance.
In addition, always let washable filters dry completely before putting them back, and check the filter sooner if the air conditioner smells musty when it runs.
When Cleaning the AC filter Doesn't Solve the Problem
Cleaning the filter helps the air conditioner continue delivering steady airflow and efficient cooling, but it isn’t a substitute for professional servicing.
If the system still has poor airflow, weak cooling, water leaks, unusual noises, ice buildup or musty smells after the filter has been cleaned, the problem may lie elsewhere in the unit. If you have a wall-mounted unit, the split system maintenance checklist covers the other components worth checking. Reach out to a licensed air conditioning technician to inspect the system and identify the cause.
At BG Electrical & Air Con, we provide free quotes for AC services throughout Brisbane. If your home is in any of our service areas, don’t hesitate to get in touch. We’ll take a look at your air conditioning unit and give you our honest assessment of what’s wrong and what you’ll need to fix it.
Contact us today.