Thanks for looking!
Not sure the R value of the 2" closed cell. I do know I was told but have since forgotten. We do get cold winters here but "cold" is relative. If you're from Florida then yeah it's cold. If you're from up north then no you wouldn't consider our winters harsh. We get really cold, but our winters are relatively short.
As far as HVAC goes package units are used more frequently than you would think. I see many folks using mini splits and like most things everyone has a preference for one reason or another. None of them are necessarily wrong, just personal preference.