Air_well_(condenser) An air well or aerial well is a structure or device that collects water by promoting the condensation of moisture from air. Designs for air wells are many and varied, but the simplest designs are completely passive, require no external energy source and have few, if any, moving parts.An air well requires moisture in the air, but everywhere on Earth, even in the hottest climates, the atmosphere contains at least some water. According to a paper by Beysens and Milimouk