ttystikk
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There are apparently quite a few varieties of fish that are particularly amenable to our purposes, including but not limited to pacu, tilapia, trout, carp, bass, catfish and more. One important decision to make early is whether you want to maintain warm water fish or cold. Warm varieties tend to be more productive, yield more, eat more and of course add more ammonia and such to the system. They can also be expensive to keep warm in the winter.
Again, I'm parroting back information I've gathered second hand. The hands on person to talk to about aquatics is @Seamaiden ...so I tag thee, in hopes that she shall appear and enlighten all of us!
Back to the AC part. I'm choosing a warm water system, with the tank water to hover around 60 at a bare minimum in the winter, and warm into the 70s F in summer. I believe I can keep the tank water warmer than 60 all winter, because I already employ an integrated water cooling system, connected to a 2 Ton chiller. What's the connection? Well, water- the chiller's job is to remove heat from a closed circuit water system that chills RDWC as well as cools and dehumidifies the growroom.
If I run the return from those circuits through a water to water heat exchanger, passing it across water coming inside from the fishtank, then the excess heat ends up in the nutrient water, just as it's coming inside to do all of its filtration, nitrification and purification duties. This encourages those processes, and the now chilled return water in the cooling system returns to the reservoir, ready to be used again. Only when the water outside is not sufficiently cold will the indoor chiller unit chug to life and actively cool the circuit.
Meanwhile, that warm water passes through the entire indoor part of its cycle, now warmed up to its optimal temperature. It's then returned to the tank outside, keeping it and fish warm without the use of a heating element!
We'll cover walking on water another time, lol.