I know it's the dead of winter, and many of us are thinking about how to keep our founts from freezing, but an idea just hit me. One of the suggestions I got was a submersible fish tank heater right in the 5-gallon nipple fount. What if the same idea could be adapted to keep water cool in the summer? Our chickens suffer something fierce here in Texas summers. Has anybody figured out a cooling coil that goes right into the fount? It would need to be electric and not too fragile in case chickens climb up on the tubing etc.