Kurt, if you can afford to go deeper i would think it would minize heat transfer. More deep area v's shallow. Many people around here thought it was a waste of time/money for me to go to 18 ft with my pond here in Fl. But i feel that i will have the chance to grow larger fish due to them having access to colder water during the hot summers. They are unlikely to slow down eating (during summer time) compared to shallow ponds in my area. I think its money well spent as long as you can areate all of the depth so its usable. My areator runs 24/7 at 18 ft deep.
