How to Clean Air Conditioner DIY at Home?

Recently, I’ve been working from home and it gets unbearably hot during the day. As a result, my aircon is turned on almost 24 hours everyday. With a sudden increase in usage, I started thinking about the best ways to clean and maintain my aircon.

We usually engage a professional to service all three aircon units in our 4-room HDB flat once every three to four months. The cost of aircon servicing can range from $20 to $100 per unit and we have to schedule in advance as aircon cleaning services can get booked up quickly, especially during the warmer seasons. I always end up procrastinating as it can be quite a chore, especially if the aircon seems to be working perfectly fine.

However, it is important to clean your aircon regularly and maintain a regular servicing schedule to keep the aircon clean and efficient, as well as to ensure the longevity of your aircon.

3 Types of Aircon Cleaning 

In Singapore, there are generally three types of household air-conditioner cleaning - general aircon cleaning, evaporator and condenser cleaning, and chemical wash.

1. General Aircon cleaning 

General aircon cleaning typically involves cleaning the air filters within the aircon and the exterior of the aircon, which can be easily done by yourself. The air filters are an important component in the aircon that trap dust and dirt, preventing these particles from entering and damaging the aircon. 

If the air filters are not cleaned regularly, the accumulated dust and dirt will clog the air filters, taking a longer time and more energy to cool the room. Clogged air filters will also decrease the air quality in the room, leading to higher risks of health and respiratory issues. 

2. Evaporator and Condenser Cleaning 

The evaporator and condenser are the components in the aircon that are in charge of the cooling process. The main function of an evaporator is to absorb heat from the indoor air. As warm indoor air passes the evaporator coils, the refrigerant absorbs this heat, causing it to evaporate into a cool gas that is circulated back into the room.

The condenser, on the other hand, releases the heat absorbed from indoors to the outside air. When the refrigerant absorbs heat, it changes from liquid to gas form and flows into the condenser. When the refrigerant cools down, it condenses into liquid form and returns to the evaporator to repeat the cycle. 

You could do simple cleaning of the evaporator and condenser coils on your own with a soft brush, vacuum cleaner or cloth, to remove any visible dirt, dust and debris. 

3. Chemical Cleaning

Chemical cleaning involves dismantling parts of the aircon and washing them with chemicals. It is a way to eliminate deep-seated dirt, mold and other substances that cannot be removed with a vacuum or regular cleaning. It is best done by a professional as it involves detachment of delicate aircon components and using the right chemicals.   

5 Tools for DIY Aircon Cleaning

1. Soft Brush
2. Vacuum with a brush attachment
3. Mild detergent
4. Water
5. Cloth

10 Steps to DIY Aircon Cleaning

You may have the steps to clean the aircon yourself, but it is recommended to have a professional check on it at least once a year. A professional is able to identify issues early and prevent further problems and bigger costs later. 

1. Turn off the power of the aircon and disconnect the power supply for safety reasons. 
2. Remove the aircon front cover. Some aircon units may require a screwdriver for this step. 
3. Remove the aircon filters and wash with mild soap and water. Do not use hot water as it may shrink the filters. 
4. Rinse and dry in an open shaded area away from direct sunlight. 
5. If the filters are too old, you may consider replacing them directly with new filters. 
6. Use a vacuum or brush to clean and remove any dirt and debris from the evaporator and condenser coils.
7. Check the drain pan for mold and blockage. You may clean the pan with water and soap before leaving it to dry. 
8. Ensure the drain line is clear of obstructions. You may flush it with water to unclog any debris stuck inside. 
9. Once everything is dry, reassemble the parts with attaching filters as the last step. 
10. Wipe the exterior of the aircon cover and reattach to the aircon unit.

If your aircon gives off strange odours or sounds, takes a long time to cool the room or water starts leaking, it could be a stronger indication that professional cleaning or repair is required.