You will never get cooler than the Wet Bulb temperature with a evaporation cooler (which is what this essentially is). In most conditions found on earth this w

You will never get cooler than the Wet Bulb temperature with a evaporation cooler (which is what this essentially is). In most conditions found on earth this will be well above 4.5C https://en.wikipedia.org/wiki/Wet-bulb_temperature https://en.wikipedia.org/wiki/Wet-bulb_temperature