How to Clean Your Air Conditioner Before Summer — The Complete Korea Guide

 

As temperatures climb toward summer levels, households across Korea are scrambling to get their air conditioners ready. But turning on a unit that has been sitting unused all winter — without cleaning it first — means blowing dust, mold spores, and bacteria directly into your home. The result: poor indoor air quality and a higher risk of respiratory illness.

Here is everything you need to know: when to clean, how to do it step by step, how to choose between Samsung and LG, and the safety rules you must not skip.

Best Time to Clean
May–Early June
Service slots fill up fast after this
Test Run Temperature
18°C / 64°F
Full fan speed for ~20 minutes
Filter Cleaning Cycle
Every 2 Weeks
Directly affects air quality & efficiency
Interior Drying Time
1–2 Hours
Fan-only mode — prevents mold regrowth

1. When to Clean — and How to Test Run Your Unit

The golden window for air conditioner maintenance in Korea is mid-May to early June. Once the heat sets in around mid-June, service center appointments become nearly impossible to get on short notice. If temperatures in your area are already hovering around 25°C (77°F), now is the time to act.

Before cleaning, run a quick test to check the unit's condition. Set it to cooling mode at 18°C on maximum fan speed and run for about 20 minutes. While it runs, check these three things:

Test Run Checklist
1
Cooling Performance
Is the air coming out genuinely cold? Does the room cool down at roughly the same speed as last year?
2
Outdoor Unit Noise
Is the outdoor compressor running smoothly without unusual rattling, grinding, or vibration?
3
Water Leaks
Is water pooling or dripping from the bottom of the indoor unit? If so, the drain line may be blocked.

2. How to Clean Your Air Conditioner — Filter to Heat Exchanger

Step-by-Step Cleaning Guide
1
Wash the Fine Mesh Filter (Every 2 Weeks)
Open the front panel and remove the filter. Rinse from the clean side using strong water pressure to push the dust out (not deeper in). For heavy soiling, soak in lukewarm water with a small amount of neutral detergent and scrub gently with a soft brush. Dry completely in the shade before reinstalling — moisture left on the filter causes instant mold.
2
Remove Mold Odor from the Heat Exchanger
With the filter removed, you can see the metal grid inside — that's the heat exchanger (evaporator). When mold grows here, it produces the wet-rag smell that comes out when you first turn the unit on. Mix water and citric acid in a 10:1 ratio and spray it generously onto the heat exchanger fins. Then run the unit in cooling mode at 18°C for 30 minutes — the condensation will carry the contamination out through the drain.
3
Dry the Interior with Fan-Only Mode — The Most Important Step
Once all cleaning is done, run the unit in fan-only mode on full speed for 1–2 hours. This dries out the interior completely. Skip this step, and the remaining moisture will cause mold to regrow faster than before — defeating the purpose of cleaning entirely.
πŸ’‘ Where to get citric acid: Available at pharmacies or online (Coupang, etc.) for around ₩3,000–5,000 for 500g. Always use citric acid or neutral detergent — never bleach (chlorine-based cleaners). Bleach corrodes aluminum fins and releases toxic fumes into your living space when the unit runs.

3. Samsung vs LG — Which Air Conditioner is Right for You?

If you're planning to buy or replace an air conditioner this year, here's a quick guide to Korea's two dominant brands.

Brand Comparison
 
 
Samsung — Wind-Free (무풍) SeriesCool air flows through thousands of micro-holes rather than blowing directly at your body — eliminating the "cold blast" sensation. AI learns your household's usage patterns and cuts electricity consumption by up to 30%. Best for: families with young children or elderly members, anyone sensitive to direct cold airflow, energy efficiency-focused buyers.
 
LG — Whisen Tower SeriesPrecise multi-directional airflow (up, down, left, right) cools a room rapidly. Built-in UV LED sterilization and auto-dry self-cleaning system makes hygiene maintenance easier. Best for: single-person households, dual-income couples who want a powerful cool-down fast, hygiene-conscious buyers.

4. Safety Rules — Do Not Skip These

⚠️ Always unplug before cleaning (non-negotiable):
Before touching anything inside the unit, unplug it from the wall or switch off the dedicated circuit breaker. Spraying water near live electrical components risks electric shock and can fry the main circuit board.
🚫 Never use bleach or strong acid cleaners:
Bleach (sodium hypochlorite) and strong chemical cleaners corrode the aluminum heat exchanger fins. Worse, when you run the unit afterward, the chemical residue becomes airborne and goes straight into your lungs. Stick to citric acid solution or neutral detergent only.
🌬️ Clear the area around the outdoor unit:
If the outdoor compressor unit is blocked by objects, dust, or poor ventilation, heat cannot escape efficiently. Cooling performance drops and — in serious cases — overheating can cause a fire. Keep the area around the outdoor unit clear and ensure the ventilation grilles are unobstructed.

5. Free Inspection Services from Samsung & LG

If DIY maintenance isn't your thing, both Samsung and LG run free pre-summer air conditioner inspection campaigns every spring. A certified engineer visits your home at no charge and checks refrigerant pressure, electrical wiring, and outdoor unit condition.

πŸ“… When: April–June each year (slots fill up before peak heat — book early)

πŸ“± How to book: Through each brand's customer service app or by phone

☎ Samsung Electronics Service: 1588-3366
☎ LG Electronics Service: 1544-7777
πŸ“Œ Key Takeaways
  1. The best time to clean is mid-May to early June — book now or start DIY cleaning before the heatwave hits.
  2. For the heat exchanger: use a citric acid spray. After all cleaning: run fan-only mode for 1–2 hours to dry the interior and prevent mold from coming back.
  3. Can't stand direct cold airflow? Go Samsung Wind-Free. Want powerful cooling and easy hygiene? Go LG Whisen Tower.
"An air conditioner isn't just an appliance that makes wind.
It's the device that circulates the air your family breathes.
Thirty minutes of maintenance now means a healthier summer."

Don't wait until the heatwave hits to discover your air conditioner smells, underperforms, or breaks down — with no technician available for weeks. A quick clean-up now, while things are still manageable, is the smartest move you can make before summer arrives.

※ This article is based on official guidance from Samsung Electronics Service, LG Electronics Customer Support, and the Korean Ministry of Environment. Specific button names and model features vary — refer to your product manual for exact instructions.
KN

KoreaNews English

Making sense of Korea — Economy, Society & Daily Life. The English edition of sisainform.com

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