Originally Posted by FTMMWS
Hmm,,IDK seems the people with 90's are are pretty close to it too
I lose nearly a couple gallons a day like I stated above, but I have a couple of 4 inch fans blowing air into my canopy directly over the water. I also have two power heads agitating the surface. With my large open sump, the sock bubbles because of pressure - flow (2200 gph
), and my overflow is a two foot drop to the bottom of the tank (noisy). I use all this to help cool the tank, and it always sits at least 1 degree below ambient. I've experimented with different methods of slowing evaporation, but my tank temp quickly rises. With all this, especially if I run the a/c alot I lose even more. But still cheaper than a chiller for me.