Passive cooling

Passive cooling is a way to keep something cool without using electric power (like from a fan or air conditioner). It's possible to use natural processes like wind, water, and air to cool something down. For example, if you have a window open on a warm day, the wind that blows in can help cool down the room. Or if you have a large water tank near the building, the water can absorb heat from the building and help keep it cool.