Originally Posted by
LTC8K6
It seems like if there is enough moisture in the air for these devices to produce a useful amount of water, then you don't need the device because water is readily available. There is either a water source in the area, or it rains a lot in the area, or both.
The second product I linked to (not Fontus) supposedly works down to 20% humidity.
In some climates the difference between nighttime and daytime temperatures may give huge relative humidity swings, so an area generally recognized as arid or low-moisture, may still produce a morning dew. This makes "dew harvesting" a possibility:
https://en.wikipedia.org/wiki/Air_we...ew_Utilization