We know the best place to catch a cool breeze is by the coast, as the air will be cooled by evaporating water as it blows across the ocean?
Evaporative air-conditioning systems work the same way – warm outside air is cooled as it passes over water-saturated pads in the air-conditioning unit that sits on the roof. The cooled air is then blown down a central dropper, distributed through the ducting and enters each room via ceiling vents.