I have IG 16x32 plaster pool facing south also. Live in Pa and get about 4 months use with a heater. Propane is expensive so we dont heat the pool as much as we would like but a guess for popane and electric for running filter 8 to 10 hrs a day is $500.00, pool closing is 275.00, we open it ourselves. If I had enough confidence to blow the lines I would close it myself. I use pucks and bleach so add roughly about 225.00 and a round ball park figure for me is 1000.00 a yr., not counitng iems that you may have to replace during the year for maint, i.e.test kits, vaccum equip., etc.