냉방이 · 냉방을
air conditioning, cooling
Example
지하철 안은 냉방이 잘 되어서 시원해요.
The subway is well air-conditioned, so it's cool.
Word parts
냉 cold+방 room
Literally 'cold room'; the opposite is 난방 'heating'.
Good to know
냉방병 is a common Korean term for colds or fatigue blamed on strong air conditioning.