Hello Corp_Ag12, I'm not sure I can answer all your questions, and at this point, the technician is set to come out later today to do the work, but I do appreciate your assistance (and all the other folks who have chimed in here). TexAgs is a great resource.
My pool is 13,000 gallons (estimate). We have an old-school automation system (it's a metal dial that turns on and off my main pump, and another dial that does the same for the Polaris pump). The technician said that if I purchased a whole new unit I could get a wifi capable one that would use an app, but I told him that, if possible, I'd rather use the system in place as it has not failed us in the 7 years we have lived here. It's old, but it works.
I'm not sure of the HP on my current pump, but the replacement was 2 HP, I believe. We have had it serviced at least twice since we moved in, but that was a while back. At this point, I will limp along until we sell the house. We have two kids in school here, and we love the area, but once my youngest graduates, I'm thinking we will be migrating to a less crowded area (also, hopefully, one with lower property taxes, but who are we kidding, everywhere in Texas has high property taxes).