When was the last time you cleaned your air conditioner filter? When dirt accumulates in the filter, it not only reduces the effectiveness of heating and cooling, but also increases electricity bills and can cause unpleasant odors. Many people probably put it off because they "don't really know how to do it."

Anyone can easily clean an air conditioner filter if they know the correct procedure. This article explains everything from the necessary tools to specific steps, frequency guidelines, and precautions, in order.

If you want to make filter cleaning a habit, or if you're cleaning it for the first time in a while, please refer to this article.

What happens if you don't clean your air conditioner filter?

Air conditioner filters play a role in catching dust and dirt when drawing in indoor air. If they are not cleaned regularly, various problems are more likely to occur. First, let's look at the effects of dirty filters.

Impact on electricity bills

When dust accumulates in the filter, the resistance when the air conditioner draws in air increases. As a result, more energy is consumed to maintain the same room temperature, which tends to increase electricity bills.

In general, clogged filters are known as one of the factors that reduce heating and cooling efficiency. Just making regular cleaning a habit can help suppress unnecessary energy consumption.

Decreased heating and cooling efficiency

When the filter is clogged, the amount of air the air conditioner can send into the room decreases. If you feel that "it's not cooling down even though it's set to the desired temperature" or "it's slow to warm up," dirt on the filter might be one of the causes.

When the airflow drops, heating and cooling become less effective throughout the room, impairing comfort. Maintaining the filter's breathability through cleaning helps bring out the air conditioner's original performance.

Risk of mold and odor generation

Accumulated dust and moisture in the filter create an environment where mold can easily grow. If the air conditioner continues to be used, mold spores and odors may spread throughout the room. Special care is needed during the rainy season and summer, when humidity is high.

If "the air conditioner smells strange when turned on," it's often related to a dirty filter. Regular cleaning to maintain a clean state is important for protecting the indoor air environment.

What you need to clean your air conditioner filter

Before you start cleaning, it's a good idea to gather the necessary tools to ensure a smooth process. You don't need many special items; what you have at home should be sufficient.

Basic tools (vacuum cleaner, brush, towel)

The minimum tools required to clean an air conditioner filter are as follows:

• Vacuum cleaner (a nozzle attachment is convenient)
• Soft brush or old toothbrush
• Dry towel or kitchen paper
• Mask (to avoid inhaling dust)

The vacuum cleaner is used to suck up dust from the filter surface. The brush is useful for removing fine clogs, and the towel is used to wipe off water after washing. Wearing a mask during the work will reduce the risk of inhaling dust, so it's safer.

Items used for washing with water

If the filter is very dirty, washing it with water is effective. Here are some convenient items to have ready when washing with water.

• Shower or place where water can be used (bathroom, outdoors, etc.)
• Neutral detergent (dish soap is fine)
• Soft sponge or brush
• Drying space (shade is ideal)

If using detergent, the key is to choose a neutral one. Strong acidic or alkaline detergents can damage the filter material. Choosing a drying space that is not exposed to direct sunlight will help prevent the filter from deforming.

How to clean an air conditioner filter, step by step

By following the correct procedure for cleaning the filter, you can thoroughly remove dirt without damaging the filter. We will explain the process step-by-step, from removal to drying and reinstallation.

How to remove the filter

First, turn off the air conditioner and unplug it before starting the work. If the power is on, dust may scatter or lead to unexpected accidents, so always confirm the power is off before proceeding.

Lift the front panel of the air conditioner by hand or open it by pressing the tabs on both sides. The opening method varies depending on the model, so it's best to check the instruction manual rather than forcing it open. Once the panel is open, remove the filter from the top groove and pull it out slowly. At this time, try to remove it without tilting it to prevent dust from falling around.

Removing dust with a vacuum cleaner

First, vacuum the dust from the removed filter. Filters have a front and back, and it's generally best to vacuum from the back, opposite to the direction of airflow (from outside to inside). This effectively removes clogged dust.

Do not press the vacuum cleaner nozzle firmly against the filter; move it gently over the surface. If there's a lot of dust, place the filter on newspaper or an old sheet before cleaning to keep the surroundings clean.

How to wash with water

After removing dust with a vacuum cleaner, we recommend washing the filter with water if it's visibly dirty. In a place where water can be used, such as a bathroom or balcony, flush the filter from the back side with a shower or tap water. Remember to always flush from the back side, as flushing from the front can push dirt deeper.

If you are concerned about oil stains or odors, it is effective to soak the filter in lukewarm water with a neutral detergent for a while and then gently wash it with a soft sponge. After washing, rinse thoroughly to ensure no detergent remains.

Drying and reinstallation steps

After washing, lightly wipe off excess water from the filter with a dry towel, then let it dry completely in a well-ventilated, shaded area. Direct sunlight can cause deformation or discoloration, so drying in the shade is essential. The drying time varies depending on the season and humidity, but allow at least 2 to 3 hours for thorough drying.

Once you've confirmed it's completely dry, reinsert the filter by reversing the removal steps. Installing it while wet can lead to mold growth, so if it's not sufficiently dry, wait a while before putting it back. After installation, close the front panel securely and check that the air conditioner operates normally for peace of mind.

Appropriate frequency for air conditioner filter cleaning

The frequency of cleaning is just as important as the method. By making a habit of regular care, rather than rushing to clean after dirt has accumulated too much, you can use your air conditioner comfortably for longer.

Generally, once every two weeks is a good guide.

Generally, air conditioner filters should be cleaned approximately once every two weeks. By following this frequency, dust can be removed before it accumulates, making each cleaning less of a hassle.

Some people may feel that "once every two weeks is too often," but if there's just a thin layer of dust on the filter, a quick vacuuming is all that's needed. Water washing is only necessary when the dirt is noticeable, so daily maintenance shouldn't be too much of a burden.

Adjustment points based on season and usage conditions

In summer and winter, when air conditioners are used almost daily, it may be better to clean them more frequently than every two weeks. On the other hand, during seasons like spring and autumn when they are used less often, once a month is often sufficient.

In households with pets, or during seasons with a lot of pollen or yellow dust, filters tend to get dirtier than usual. If you feel that "the air conditioner isn't working as well lately," it's a good idea to check the filter condition first. Adjusting the frequency according to your usage environment will help maintain the air conditioner's original performance.

Points to note when cleaning air conditioner filters

While the cleaning process itself is simple, there are a few points to be aware of. Knowing common mistakes beforehand can help you avoid damaging the filter and extend its lifespan.

Risks of installing while wet

If the filter is reinstalled before it's completely dry after washing with water, moisture can easily build up inside the air conditioner. A damp environment creates conditions where mold can easily grow, leading to odor and hygiene problems, even after cleaning.

While the desire to use it quickly is understandable, avoid rushing to install it if it's not sufficiently dry. If you're in a hurry, using the cool setting on a hairdryer can speed up drying. Hot air can deform the filter, so always use cool air.

Filter damage due to excessive scrubbing

The filter material is thin and delicate, so if you scrub it too hard to remove dirt, the fibers can be damaged and tear. A torn filter will not perform as it should, so it will need to be replaced.

If you are concerned about stubborn dirt, the trick is to soak it in lukewarm water with a neutral detergent to soften the dirt, then gently wash it as if you are pressing it. Washing carefully and without rushing will help prolong the life of your filter.

Permissibility of detergent use

If you want to use detergent when washing the filter with water, always choose a neutral detergent. Acidic or alkaline detergents can degrade the filter material and may cause discoloration or deformation.

Also, some air conditioners have antibacterial and antifungal treatments on their filters, and using detergent may reduce their effectiveness. If you're concerned, check the air conditioner's instruction manual or stick to rinsing with water only to be safe.

When to consider professional cleaning and the cost

While filter cleaning is a maintenance task you can do yourself, there are situations where it's better to hire a professional. Consulting a professional early, rather than trying to handle it yourself, can also help extend the life of your air conditioner.

Guidelines for when professional cleaning is necessary

If you observe the following conditions, filter cleaning alone may not be sufficient. Consider contacting a professional:

• Even after cleaning the filter, odors or dirt do not improve.
• You see black stains or mold-like substances inside the air conditioner.
• There are abnormal noises during operation, or the airflow is extremely weak.
• Dirt has accumulated on components other than the filter (e.g., heat exchanger).

If the cause is not just a dirty filter, but mold or dirt has accumulated in the internal fan or heat exchanger of the air conditioner, self-cleaning becomes difficult. Leaving such conditions unaddressed can lead to air conditioner malfunction, so it's recommended to address any concerning symptoms early.

Cost estimate for professional cleaning

The cost of air conditioner cleaning varies depending on the company and model, but for a standard wall-mounted air conditioner, it is generally around 8,000 to 15,000 yen per unit. For self-cleaning air conditioners or ceiling-mounted types, the cost may be slightly higher due to their complex structure.

Some companies offer discounts when multiple units are requested at once, so if you have several units, it might be more cost-effective to have them all cleaned together. It's advisable to get quotes from several companies and compare their services and prices before deciding who to hire.

How to use air conditioner filters to reduce cleaning effort

Even though regular cleaning is important, it can often be put off in our busy daily lives. In such cases, it's good to implement strategies that reduce the cleaning effort itself.

The option of replaceable filters

Using "replaceable filters" that are layered over the existing air conditioner filter means you only need to replace them with new ones when they get dirty, significantly reducing the hassle of washing and drying. This also helps suppress dirt accumulation on the filter itself, making it an effective way to keep the inside of your air conditioner clean.

For those who want to "reduce cleaning frequency" or "find washing a bother," this is an easy and sustainable option.

Benefits of antibacterial filters

Among replaceable filters, those with antibacterial treatment can be expected to suppress the growth of mold and bacteria. They are suitable for seasons when odors are easily noticeable, households with small children, or those concerned about allergies.

"Air King's" antibacterial air conditioner filters are characterized by their ease of installation, simply by attaching them to the air conditioner's intake vent. They not only catch PM2.5, pollen, dust, and bacteria, but also have antiviral, antifungal, and deodorizing effects. They are compatible with both household and ceiling-mounted types, so if you want to improve your indoor air environment while reducing cleaning effort, be sure to check them out.

▶ Click here for Air King's air conditioner filters

 

Frequently Asked Questions About Air Conditioner Filter Cleaning

Here are some common questions about filter cleaning. Please refer to them if you have any concerns.

Should I replace the filter if it's torn?

If the filter has tears or large holes, it's best to avoid continuing to use it. Dust and dirt can directly enter the air conditioner's interior through the torn parts, potentially leading to dirt accumulation on the heat exchanger or causing malfunctions.

While minor fraying might be acceptable to monitor, if there are obvious holes, we recommend replacing it with a new filter. Utilizing replaceable filters also offers the advantage of easy replacement when they become dirty or damaged.

What if the odor doesn't disappear even after cleaning?

If the odor does not improve even after cleaning the filter, there is a possibility that mold or dirt has accumulated in the internal fan or heat exchanger of the air conditioner. While commercially available sprays can sometimes address such internal dirt, professional cleaning is effective for deeply embedded grime.

Also, an air conditioner that hasn't been used for a long time may emit an odor when turned on again. In that case, operating it in fan mode for about 30 minutes while ventilating the room by opening windows may help reduce the odor. If it still doesn't improve, it's safer to consult a professional promptly.

Should I clean the filter myself even in a rental property?

Even in rental properties, it is generally the tenant's responsibility to perform routine air conditioner filter cleaning. Filter cleaning is often treated similarly to managing consumables, and if the air conditioner breaks down as a result of neglect, the tenant may be asked to bear the repair costs.

On the other hand, for professional cleaning of the air conditioner's interior or replacement of parts, it's best to consult the property management company or landlord first. Since the terms may vary depending on the contract, it's recommended to confirm any unclear points beforehand.

Summary | Keep your air conditioner comfortable with regular filter cleaning

A dirty air conditioner filter can lead to various problems, including increased electricity bills, decreased heating and cooling efficiency, and the generation of mold and odors. The basic cleaning routine involves vacuuming dust about once every two weeks and washing with water if visibly dirty. Key tips for extending filter life include ensuring thorough drying before reinstallation, avoiding excessive scrubbing, and using neutral detergents.

If cleaning the filter doesn't resolve the issues, or if you're concerned about dirt inside the air conditioner, hiring a professional is also an option. For those who want to make daily maintenance easier, there's also the option of using adhesive, replaceable antibacterial filters. On the "Air King" air conditioner filter page, you'll find a lineup for both household and commercial use, so if you're interested, please take a look.