Summer in South Korea has always been hot and humid, but in recent years the heat has become increasingly difficult to treat as an ordinary seasonal inconvenience. Air conditioning now feels less like an optional comfort and more like part of the basic infrastructure of everyday summer life.
July 2026 was another reminder of that change. According to the Korea Meteorological Administration, the nationwide average temperature reached 26.8°C, 2.2°C above the climatological normal. The average nighttime low was the highest recorded since nationwide observations expanded in 1973, and South Korea experienced an average of 9.7 tropical nights during the month, the highest July figure on record.
But adapting to hotter summers does not simply mean installing more air conditioners. Korean apartment design has changed, crosswalk shade umbrellas have appeared across cities, public buildings are being used as cooling centers, and some bus stops now provide enclosed air-conditioned spaces.
What interests me most as someone living in Korea is that many of these changes are quite ordinary. They range from a small room beside an apartment balcony to a large umbrella beside a crosswalk. Over time, these details have quietly become part of how people live through the Korean summer.
Why Newer Korean Apartments Have Space for AC Outdoor Units
On older apartment buildings in Korea, it is still common to see air-conditioning outdoor units attached to balcony railings or exterior walls. In many newer apartments, however, the outdoor units are placed inside a designated space within each home. Housing standards began requiring space for air-conditioning exhaust equipment inside apartment units for projects applied for after January 2006. Current South Korean housing construction regulations also specify requirements for the size, separation, installation, and maintenance of these spaces.
In everyday Korean apartment life, this often appears as a small silwoegisil (실외기실), or outdoor-unit room, with large louvered vents facing outside. I have lived in apartments with this type of space for quite a long time.
Every summer, our apartment management office repeatedly makes announcements over the building speaker system reminding residents to open the louvers before using their air conditioners. It is not simply advice about getting better cooling performance. An outdoor unit produces a great deal of heat, and if that hot air cannot escape, the temperature inside the small room can rise considerably.
Poor ventilation can place additional stress on the equipment and increase the risk of overheating. Korea’s National Fire Agency has also repeatedly warned about proper inspection and management of outdoor AC units because electrical faults, damaged wiring, contamination, and overheating can contribute to fires.
Because I hear those announcements every summer, I sometimes notice the louvers on other apartment buildings when I am out walking. On an extremely hot day, I occasionally see an apartment with its outdoor-unit louvers completely closed and find myself wondering, “Are they not using the air conditioner today?” It is a very small observation, but to me it is part of modern Korean apartment life. Opening those louvers at the beginning of the cooling season has become almost as seasonal as adjusting the heating system when winter arrives.
I also write about Korean apartment culture and Korea’s traditional ondol heating system.
Cooling Buildings Creates Its Own Trade-Offs
As summers become hotter, air conditioners naturally run for longer periods. They cool the indoor space but consume electricity and release heat outdoors through their condenser units. This creates a basic cooling dilemma: the hotter the environment becomes, the more energy people need simply to maintain a safe and comfortable indoor temperature.
Building design can either reduce or increase that demand. Modern Korean business districts contain many office towers with large glass curtain-wall facades. These buildings are not automatically energy inefficient, but their summer cooling load can increase when large amounts of solar heat enter through the facade.
The result depends on much more than whether a building looks “glassy.” Orientation, window-to-wall ratio, insulation, Low-E glass, external shading, and double-skin facade systems can all change how much solar heat reaches the interior.
That is why adapting to hotter summers cannot be reduced to buying stronger air conditioners. Buildings that block unwanted summer heat in the first place can reduce the amount of mechanical cooling needed afterward.
The same principle applies outside buildings. Shade, ventilation, trees, and places where people can temporarily escape the heat are much simpler technologies, but they can reduce direct exposure without requiring every person to cool a private indoor space.
Crosswalk Shade Umbrellas Became Part of the Korean Summer
One of the most visible examples can be found while waiting to cross a street. During summer, large parasol-shaped shade structures appear beside crosswalks throughout South Korea. Standing at a red light may take only a minute or two, but under strong midday sunlight there is a noticeable difference between waiting in direct sun and stepping underneath one of these umbrellas.
The idea expanded rapidly after Seocho District in Seoul installed its Seoripul Wondu crosswalk parasols in 2015. According to South Korea’s Ministry of the Interior and Safety, the number of shade structures nationwide grew from 5,662 in its first nationwide survey in 2019 to 39,514 in 2026. The designs have also changed. Some newer versions automatically close when winds become strong, while others use temperature and sunlight sensors. In some places they are combined with fine water mist systems.
I find these umbrellas interesting precisely because they are not particularly complicated. A large piece of fabric placed where people already have to stand can make an uncomfortable summer wait noticeably easier. They also connect with the broader way umbrellas are used in everyday Korean life. I discuss that in more detail in my article on umbrellas in Korean culture, including their use for rain, sun protection, and public shade.
Cooling Centers and Smart Shelters Help Outside the Home
Another problem with extreme heat is that not everyone can simply stay home with the air conditioner running all day. Some households have inadequate cooling, while electricity costs can also make heavy AC use difficult. Older people and those living alone can be particularly vulnerable during long heat waves.
South Korea has operated designated cooling centers, known as mudeowi swimteo (무더위쉼터), for many years. The program began with the government’s 2006 heat-wave measures, initially using community offices, senior centers, and village halls as places where vulnerable residents could access air conditioning. The system has gradually expanded. In 2026, the Ministry of the Interior and Safety explained that cooling centers now include everyday places such as public libraries, railway stations, financial institutions, community centers, and senior facilities.
These places are not glamorous pieces of urban technology, but that is exactly why they matter. Heat risk is partly a housing and economic issue: two people living through the same outdoor temperature may face very different levels of danger depending on their age, health, home, and access to air conditioning.
Some local governments have also introduced enclosed “smart shelters” at selected bus stops. These can include air conditioning and heating, real-time transportation information, phone charging, Wi-Fi, and other features. They should not be mistaken for the standard Korean bus stop. Most bus stops are still much simpler, and availability varies considerably by city and district. But when the temperature is dangerously high, even a small cooled waiting space can make a significant difference for someone who has no choice but to be outdoors.
Extreme Heat Cannot Be Solved by Air Conditioning Alone
As Korean summers grow hotter, the amount of time people depend on air conditioning is likely to increase. But simply adding more cooling equipment cannot solve every part of the problem. Homes need effective insulation and ventilation. Outdoor AC units need enough space to release heat safely. Buildings can reduce solar gain before it becomes an indoor cooling problem, while streets need shade and public spaces where people can escape dangerous temperatures.
There are also limits to how evenly these adaptations are distributed. Some cities have many smart shelters and shade structures, while other neighborhoods have fewer. Heat-related illness still occurs during severe heat waves, including among people who become dangerously hot inside their own homes.
Still, the changes are easy for me to notice because I have lived through Korean summers for many years. I remember when waiting at a crosswalk simply meant standing under the sun. Now many of those intersections have large shade umbrellas. At home, summer also means hearing our management office remind residents again and again to open the outdoor-unit louvers before turning on the air conditioner. Those details may seem insignificant compared with the larger issue of climate change, but they are where adaptation becomes visible in everyday life.
If South Korean summers continue to become hotter, I think the response will have to involve more than stronger air conditioners. Homes and offices will need to absorb less heat, cities will need more shade, and cooling spaces will need to remain accessible to people who cannot adequately cool their own homes. Living with extreme heat is increasingly becoming a question of how the places around us are designed.
About the Author 🇰🇷
I live in South Korea and write about the small details of Korean life and culture that I experience and observe firsthand.
English is my second language, so I sometimes use tools such as Gemini and Google Translate to help with translation and editing. The experiences, observations, opinions, and cultural perspectives in my articles are my own, and I personally review and edit every article before publishing it.
My goal with Korea Core Info is simple: to share everyday Korea from a local perspective and help international readers discover things they might not always find in a typical travel guide.
I hope my stories and guides help you understand Korea a little better — not just as a place to visit, but as a place where people live their everyday lives.