Attention for allergy sufferers: an assessment of how AC cleaning helps improve indoor air quality
Contents
A considerable number of people in Hong Kong have nasal allergies. During seasonal changes or periods of frequent air-con use, many people experience sneezing, a runny nose or itchy skin. Many people focus on outdoor air quality, but overlook the fact that an air conditioner running for long hours every day can actually become a breeding ground for indoor allergens. Understanding how dirt inside the air conditioner affects nasal allergies, and assessing the practical benefits of cleaning the unit for improving indoor air, is an important step in creating a comfortable home environment.
A Damp Interior in an Air Conditioner Can Easily Become a Breeding Ground for Allergens
During cooling, the aluminium fins and drain pan inside split-type or window air conditioners remain in a very damp state for long periods. When the air conditioner draws in indoor air for circulation, fine dust, dust mites, hair, and skin flakes in the air can easily pass through the filter and stick to the surfaces of the damp parts. In this dark and moisture-rich environment, mould and bacteria can multiply rapidly. When the air conditioner starts again, the rotating blower wheel can blow out the accumulated mould spores and dust mite remains with the cool air, directly irritating the airways of users with allergies.
Regular filter cleaning cannot reach the heavily soiled core areas
Many households regularly clean their AC filters, believing that this alone will keep the air fresh. However, the filter mainly blocks larger dust particles; tiny allergens and bacteria can still pass through the filter openings and enter the evaporator, blower wheel, and drain pan behind it. These deeper areas are dead spots that cannot be reached when the filter is removed in routine cleaning. If deep cleaning is neglected for a long time, built-up dirt can form a sticky biofilm that continuously releases odours and allergens. This is why, even after the filter is cleaned, some people still feel itchy noses or start sneezing when the AC is on.
Deep cleaning can help significantly reduce indoor airborne particle levels
Through professional deep AC cleaning, high-pressure water guns and specialised antibacterial cleaning agents can remove built-up dirt and mould from the gaps in the aluminium fins, blower wheel and drainage tray. Once these contaminants are removed, the air blown out by the AC can return to being fresh and clean, and the concentration of airborne allergens in the indoor air may also be reduced. For users with nasal allergies, this can help ease the breathing burden in an air-conditioned room.
Smooth airflow reduces high-speed operation and wind resistance noise
When thick dust builds up inside the AC, it not only encourages bacteria growth but also seriously obstructs airflow. To reach the preset temperature, the AC often has to increase fan speed or extend compressor running time, which causes stronger air circulation indoors and stirs up dust from other corners of the room, such as carpets and curtains. Deep cleaning restores clear airflow, allowing the AC to deliver air evenly at a steady, low fan speed, reducing the chance of dust being lifted by strong air movement and further stabilising the indoor air environment.
Establish a regular maintenance cycle to maintain long-term allergy protection
Improving indoor air quality is a long-term task. For users with nasal allergies, AC cleaning may need to be more frequent than for a typical household, especially at the two key times before heavy summer use begins and before the unit is switched off in autumn. In daily life, apart from regularly rinsing the filter and keeping indoor ventilation moderate, it is also helpful to check whether there are black spots or mould on the air outlet and to combine this with professional deep cleaning as a practical way to build a long-term allergy barrier for the family.
Seek help from a professional team
Deep disinfection and descaling inside the air conditioner involve complex dismantling procedures and the use of specialised chemicals. Without the relevant skills, doing it yourself may easily damage internal electronic parts or fail to clean thoroughly. Choosing an experienced professional team can help allergy-prone users improve indoor air quality from the source and regain a fresh, comfortable breathing experience at home.
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