Hi Everyone! I am building a pool Southeast of Tucson, AZ (Vail) and looking at what the best heating method would be for winter that is cost effective and what would be good for cooling during the real hot summer months. I am stubbing for heater and solar options just in case. We had a heat pump in PA and it was awesome. Of course, we only had it a few years before we had to move, so I have no idea on longevity and that was a long time ago and I would have to find the old paperwork to find out exactly what pump it was.