I came across this solution that uses the pool as a heat source/sink
http://www.thermcoenergysystems.com/wha ... _hvac.html
I have seen a unit that uses the attic as a heat source and transfers this heat to the pool, but not something
that does it in the reverse.
From what I understand, in winter the heat pump takes heat from the pool to heat the house and in spring/fall it does the reverse - yes this will work only in the south.
Have any of you come across anything similar? What is your opinion?