Ok that makes sense. Wasnt coming off that way, sounded like you were contesting the concept as a whole. maybe I missed a post(idk). And yes, most of my point has been about indoor humidity levels. Evaporation via fan will reduce temperature, but you have to do something with all that moisture in the air( dehumidifier) to prevent mildew/mold long term. A easy check for anybody would be to look at a birth facing widow in your house, does condensation collect there? Any black spots on widow sill...(?)You didn't understand my point and no I've never used a fan to evaporate water but have used a fan to defrost fish and rodents. I understand how humidity works. I understand how fans work on evaporation. My point being that it might be advantageous to cool the ATO and therefore reduce the evaporation needed. Plus excess evaporation can cause mold and those in high humidity will have less evaporation than those living in low humidity, for example.
Freeze a block of RODI and place it in the ATO. Food for thought.
And like you're saying, once the air is saturated enough, Evaporation slows thus reducing cooling effects. I can see cooling ato water helping small tanks. but a gallon of cold water, spread throughout the day, will not have any meaningful effect on temperature on say a 100g tank..