ELI5: Explain Like I'm 5

Deep water source cooling

Deep water source cooling is a method of cooling buildings and other places by using deep and cold water instead of air conditioning. Deep water comes from underground springs and rivers. This type of cooling uses a pump to bring the cold water up to the surface and then a chiller, which is like a big refrigerator, to cool the air inside the building. By using deep water for cooling, the buildings use less electricity and produce less pollution than air conditioning.