You know how on hot days 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? Well, evaporative air-conditioning systems work the same way.
Evaporative Air Conditioning is built on the following concept: 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.
The dropper is the unsung hero of evaporative systems. Its job may be simple – sit on your roof and connect the air-conditioning unit to the ducting – but if it is not completely watertight, you’ll be getting an unwanted indoor water feature along with that cool breeze.