Summer in Korea brings intense heat, high humidity, and monsoon rains. For international students and working holiday travelers experiencing your first Korean summer, taking a few practical steps can save you from mold, sky-high electricity bills, and unwanted pests. This checklist covers everything you need to know to keep your apartment comfortable, safe, and affordable through the summer months.
Why Summer Care Matters in Korea
Korean summers are hotter and more humid than most foreign residents expect. Average July and August humidity often exceeds 80%, and temperatures regularly reach 33 to 35 degrees Celsius. Without proper care, apartments can develop mold, air conditioners can fail when you need them most, and electricity bills can climb quickly. A little preventive work now saves you real money and stress later.
Air Conditioner Maintenance
Your air conditioner is your best friend all summer, but only if it works well.
- Clean the filter every two weeks: dirty filters reduce cooling power and increase electricity use
- Wipe down the front panel and vent with a damp cloth monthly
- Check for water leakage around the unit and drainpipe
- Set the temperature between 24 and 26 degrees Celsius for the best balance of comfort and cost
- Use the timer function when sleeping to avoid overnight overuse
- Close curtains during peak sunlight to reduce cooling load
Ventilation and Air Quality
Even with air conditioning, apartments need regular ventilation to prevent stale air and moisture buildup.
- Open windows for 10 to 15 minutes each morning and evening when outside air is cooler
- Run the bathroom exhaust fan during and after showers to remove humidity
- Use the kitchen range hood when cooking
- Check air purifier filters if you have one
Humidity and Mold Prevention
Mold thrives in Korea’s summer humidity. Bathrooms, closets, and behind furniture are the most common problem spots.
- Consider a small dehumidifier for closets and bathrooms (available at Daiso for around 5,000 won)
- Wipe down bathroom tiles and shower area after each use
- Keep closet doors slightly open when possible for air circulation
- Do not push furniture flush against walls, especially outer walls
- If you spot mold early, clean with a mixture of vinegar and water or a Korean anti-mold spray (kunggom-je)
Pest Prevention
Summer brings mosquitoes, ants, and occasionally cockroaches to Korean apartments.
- Install mosquito screens on windows if they are not already there
- Use plug-in mosquito repellents or electric mosquito coils at night
- Keep food sealed in containers and take out trash frequently
- Seal small cracks around drains and pipes with silicone caulk
Electricity Bill Tips
Korean electricity uses a progressive rate structure. The more you use, the higher the per-unit cost. Small habit changes save real money.
- Unplug electronics when not in use (standby power adds up)
- Use LED bulbs if your fixtures still have older bulbs
- Set your refrigerator between 3 and 4 degrees Celsius (not colder)
- Consider a fan alongside air conditioning to circulate cold air more efficiently
Frequently Asked Questions
Q: How much should I expect to pay for electricity in summer?
Typical summer electricity bills for a single-person officetel range from 30,000 to 70,000 won per month, depending on air conditioner usage. Heavy use can push this above 100,000 won.
Q: Where can I buy summer supplies cheaply?
Daiso is the go-to store for dehumidifiers, fans, mosquito repellents, and cleaning supplies. Coupang and Naver Shopping have larger appliances at good prices with fast delivery.
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Related: See our complete guide to 8 Seoul neighborhoods for international students.
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