Autumn nasal discomfort and AC maintenance: record and follow up separately
Contents
As temperatures cool in autumn, AC use decreases. After several months of frequent operation, dust and dirt have built up inside the unit. If cleaning is insufficient, those remaining particles may be blown into the room when the unit runs, affecting indoor air quality.
Why do allergies and constant sneezing always show up right when the weather turns cooler in autumn?
When autumn arrives, Hong Kong’s climate is characterised by a wider temperature difference between morning and evening, and noticeable changes in humidity. Many people think dust mites should decrease because autumn is not as hot and humid as summer, but in fact autumn is one of the peak periods for dust mite breeding and activity.
- Temperature changes may irritate the nose: Morning and evening temperature swings may irritate the nasal passages, and indoor environmental factors may also affect comfort.
- Changes in ventilation habits: in autumn, many people like to open windows for fresh air, but outdoor dust, suspended particles and pollen are carried indoors by the wind and mix with the dust already inside.
- Moisture left inside the air conditioner: After summer, moisture may remain on the inner walls. If it is not cleaned in time, it may affect internal cleanliness when the seasons change, and dust inside the unit may be blown out once it is switched on.
How many dust mites and mould are hiding inside your air conditioner?
Many homeowners think that if the AC looks fairly clean and the air coming out is cold enough, there is no problem inside. But in fact, the internal structure of an AC is complex, especially the evaporator and fan wheel area, which are the favourite hiding places for dust mites and bacteria.
Comparison items
Visible surface parts (such as the filter)
Core internal components (evaporator and blower wheel)
Environmental characteristics
Good air circulation, easy light exposure
Long-term dampness, darkness and large temperature differences
Accumulated substances
Large dust particles, hair, some skin flakes
Fine dust mites, dust mite droppings, mould spores, kitchen grease fumes
Health impact
If cleaned in time, the impact will be smaller.
Dust may be blown out when the unit is on, affecting breathing comfort.
This hidden dust circulates through the room as the AC runs. If the family stays in a closed space and the AC is poorly cleaned, indoor air quality may decline.
Is cleaning the dust filter yourself enough? Hidden blind spots in home cleaning and deep cleaning
Although many household AC cleaning sprays are sold on the market, and many people are used to removing the filter and rinsing it with water themselves, this only addresses the tip of the iceberg. Only by understanding the limits of safe cleaning can you truly tackle the allergy risk.
- Safe DIY scope (light daily care):
- Remove the plastic filter regularly and gently wash it with clean water or a mild detergent to remove larger dust particles.
- Use a dry cloth to remove surface dust from the casing panel and around the air outlet.
- Keep indoor air circulating and reduce moisture build-up.
- Areas requiring professional expertise (deep anti-allergy blind spots):
- Clean stubborn dirt and hidden mould on the aluminium evaporator fins, and avoid spraying cleaning fluid yourself and causing a short circuit if water enters the circuit board.
- Open the casing to clean the rotating blower wheel and remove black spots and dust mites tangled on the blades.
- Check whether the drain tray and drain pipe are blocked to prevent wastewater backflow and the growth of more bacteria.
Say goodbye to nasal congestion: how can all-round maintenance block allergens?
To effectively relieve nasal allergy discomfort in autumn, medication or wearing a mask alone only treats the symptoms, not the cause. You must start from the source in the home environment and properly manage the AC and indoor air.
- Build a seasonal cleaning habit: at the end of summer and the start of autumn each year (for example, between September and October), arrange a thorough deep clean of the air conditioner to remove allergens accumulated over the summer all at once.
- Make good use of dehumidifying and fan modes: when using the air conditioner in autumn, you may pair it with a dehumidifier to reduce indoor relative humidity and keep it around 50% to 60%, which helps suppress dust mites.
- Regular replacement and inspection: If there are family members with severe nasal allergies or young children, the maintenance interval should be shortened to avoid excessive dust mite buildup inside the unit.
Seek help from a professional team
If you find that no matter how you clean the filter, the indoor air quality is still poor, it often means a large amount of deep-seated dirt has built up inside the unit casing and blower wheel. At this point, seeking help from a professional AC service team is a direct solution. Professional cleaning can remove accumulated dust and odours, allowing the AC to run more smoothly.
Frequently Asked Questions (FAQ)
Q1: Why, even though you clean the dust filter often in summer, do you still get bad allergy flare-ups when the weather turns cooler in autumn and you use the AC?
A: Because dust mainly accumulates inside the air conditioner where it cannot be seen, such as on the evaporator and blower wheel. Simply cleaning the surface filter cannot remove dust deep inside the unit. When the unit is switched on in autumn, this dust may be blown out with the airflow.
Q2: In Hong Kong's autumn, humidity can rise and fall. When using AC, do you need to pay special attention to the effect of humidity on dust mites?
A: Please note. Dust mites multiply very quickly in environments with relative humidity above 60%. Although autumn is cooler, if the room is stuffy and the inside of the AC remains damp, that can actually help dust mites survive, so regular deep cleaning to remove residual moisture inside the unit is very important.
Q3: If there is a newborn baby and someone with allergies at home, how many times a year should professional AC cleaning be arranged?
A: It is generally recommended to arrange at least two professional deep cleans each year, for example once before summer and once in autumn after summer. If there are family members with severe allergies or you keep pets, you may consider cleaning every four to six months to help maintain air quality.
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