I use two fans, but water evaporates fast, i have the following setup to top up water and to make it bit chill..
have two pet bottles each is 1.5 liter capacity, will add fresh water and refrigerate it....bottle caps have small holes so that it doesn't break in the chiller and water will drip through them when added to the tank.
Every morning will just plug that bottle at top of my tank where i have a small setup from which the ice will melt and water will be added to the tank as drop by drop.
My tank has a top cover, so everything is hidden inside, my temperature is around 26 to 27.