I also live in the STL (S/E Mo.) area, and even tho we just got our new pool up & going, I know that next year we will have the same problem that everyone else who lives in this "nearly uninhabitable in July & Aug" area have, pool temps in the upper 90's. Majesticman also asked about heat pumps. Is this a viable option to heat & cool an AG pool in this area? I would like to open our pool in late Apr & keep it going through Oct so would need to heat early & late & cool in July & Aug.