When I built my pool two years ago (in central Florida) I added a heat pump to warm the water in the winter months. I have since discovered the real need is to COOL the water. My water is too hot far more often than it is too cold. From July through Sept the water temp is over 92 degrees). I like it around 85 dgrees.

I need a way to cool the water (about 10 degrees would be enough). Should I repalce the heat pump with a model that heats and cools the water? If so which brand?
Should I add an addtional cooler (for example the Glacier Pool Cooler GPC-25) which claims to cool water without freon saving electricity (its a non-heat pump device) or something else?

My pool is about 20K gallons in-ground, concrete pool, without a screen cover. I also have two waterfalls - but they add little to no noticible cooling effect.

Thanks