What's living inside
your air conditioner?
— The complete AC & HVAC guide
Filter dust raises your bill; coil mold goes into your lungs.
Once before summer, know it properly and take care of it.
~43% nationwide
the time that prevents all of it
The AC remote has a "power on" button. There's no "inject mold into my lungs" button. But the moment you turn on an AC uncleaned for 3 years, you're effectively pressing that button. This article isn't meant to scare you. It's meant to inform you accurately.
Turning on the AC isn't cooling the air.
It's sending air that passed through
the inside of the AC into your lungs.
① Dirty AC vs. clean AC — what's the difference
dust-mite corpses
mold spores · bacteria
skin flakes · pollen
cooking-smoke residue
maintains optimal cooling
fewer allergies·rhinitis
longer lifespan (avg +3yr)
₩210k saved over 3 summer months
The filter is the visible line of defense. But the real problem is behind the filter. The evaporator coil, the drain pan, the blower fan. Mold and bacteria piled up here aren't caught by the filter and spread directly into the air.
② There are 3 levels of AC cleaning
③ Good care alone changes your bill this much
With ₩50k~100k spent on cleaning, you can save ₩300k on your bill. Add the AC lifespan extension (3yr+), and it's a 10x+ return on investment.
④ AC lifespan — 7 years vs. 15 years, depending on care
An AC with zero care starts having problems from years 8~9. Many ACs that got regular care lasted over 15 years. Care doubles the lifespan.
⑤ How the AC affects your health — both sides
- →Worsens allergic rhinitis·conjunctivitis
- →Triggers·worsens bronchial asthma
- →Irritates atopic dermatitis
- →Legionella infection risk (with drain buildup)
- →Respiratory irritation while sleeping·disrupted sleep
- ✓Prevents heatwave deaths (heatstroke·dehydration)
- ✓Improves sleep quality (right temperature)
- ✓30% better focus·work efficiency
- ✓Protects children·elderly·pets
- ✓Blocks mold via humidity control
⑥ Diagnosing AC condition by symptom
Reading the signals your AC sends tells you when to clean and when to call a pro.
| Symptom | Cause | Response | Urgency |
|---|---|---|---|
| Musty smell when on | Coil·fan mold | Internal cleaning | Pro |
| Weakened cooling | Clogged filter or low refrigerant | Clean filter → if no change, recharge gas | Self first |
| Water dripping | Clogged drain pipe | Drain cleaning | Pro |
| Rattle·screech noise | Fan motor·bearing wear | Turn off and check immediately | Pro immediately |
| Shuts off during operation | Overheat protection triggers | Check outdoor-unit airflow → pro | Pro |
| Bill suddenly rises only | Low refrigerant·compressor efficiency drop | Find the cause after a check | Pro |
| Kid rubs their nose often | Allergens in filter·coil | Clean immediately, then air out | Act immediately |
⑦ Self filter cleaning — 6 steps
⑧ Annual AC care calendar
- ✓Book pro internal cleaning (before peak)
- ✓Check refrigerant gas
- ✓Remove·clean outdoor-unit cover
- ✓Check drain pipe
- ✓Self-clean filter every 2 weeks
- ✓Keep set at 26°C or above
- ✓Air out 5 min every 2 hours
- ✓Tidy around the outdoor unit
- ✓Full cleaning before season's end
- ✓Cover after drying the drain
- ✓Store filter after cleaning
- ✓Check·replace faulty parts
- ✓Freeze-protection cover on outdoor unit
- ✓Check filter when using heat mode
- ✓Book next spring's pro cleaning
- ✓Check energy-consumption efficiency
Finally — the AC is your home's lungs
Human lungs draw in air, filter it clean, and send it to the blood. The AC is the same. It sucks in indoor air, cools it, and sends it out again. What's in the middle decides your daily health.
Before summer comes, just once. Take out the AC filter and look. That's enough. If it's clean, just wash and refit it. If it's black, remember this article.
Ten minutes cleaning one filter
protects your family's health all summer.
Nothing has better value.
We'll connect you
with an AC pro now
Filter cleaning · internal wash · gas recharge · noise check
Now, before the Jul~Aug peak, is the fastest and cheapest · Free during beta
❄️ Share with family and friends — it protects their health this summer
