I wonder if circulating your water at night or leaving the cover off at night might cool it down some? Do you have a solar panel heater? Running that at night will definitely cool the pool down (kind of a reverse heating system) Ours was sitting at 89 today, but we forgot to open the diverter so it had been going through the panels during the day. Lucky for us, 8 teenagers had a swim this afternoon and splashed out a LOT so we got to top it off with some nice cool water - the salt REALLY does make such a nice difference in the way the water feels. I am picking up another 40# tomorrow along with my bleach supplies.