Aside from the fact that there isn't much water in dry air, 2257kJ of enthalpy is released for every kilogram of water pulled from air and that's a lot of heat

Aside from the fact that there isn't much water in dry air, 2257kJ of enthalpy is released for every kilogram of water pulled from air and that's a lot of heat to get rid of somewhere. Most mature cooling technologies (peltier, compressor,etc) have a COP value smaller than 1 so in other words it will take even more energy to harvest water efficiently. Trucking water might actually be cheaper.