Orlando area. I've inherited a 9000gal Gunite pool that has an AquaCal heat pump installed in 2001. I had been planning on solar (roof orientation is not ideal, but good enough), but now have to consider whether the heat pump is a better option, considering I don't have to pay to install it.
Given its age, what kind of remaining life span can I expect? Given its age, are operating costs going to be reasonable?