Your bass should be fine with just about whatever you keep them at within reason. I have a trough outside full of Sunnies and all kinds of shiners that gets up into the 80s (except for this years thanks to the monsoon season that has struck us) in the summer, and they do fine. Just need to keep lots of oxygen in the water. Remember High Temps=Low O2 carrying capacity in water.
Your wide ranging fish-most sunfish including bass, generally will do fine without any extra heating or cooling if they are kept inside. Down here we have all kinds of fish that will live the summer out in a tiny pool that is bath tub warm just waiting for a flood to flush it out. I wouldn't recommend a tank like that, but don't worry about killing a LMB because of temp.