I'm running Stinkbud's Aero Veg and Solo DWC/Aero units as a test from my usual Coco runs. Plant growth is quick but I'm noticing water temp to be the same as ambient room temp. The book says he runs room at 78 F and water stays below 70 F with no chiller. I don't understand how that's possible. He claims the Aero works like a swap cooler but I don't think there's much evaporation going on to cause a cooling affect. What am I missing?