We live in GA and our pool water tends to get into the low to mid 90's this time of year. I've been look all over this forum as well as other internet sites to find a way to cool the water. The best that everyone comes up with is to run the pump at night with a fountain. While that does work kinda ok, usually dropping the temp a few degrees overnight, I was talking with a friend and we came up with an idea and wanted to run it by people here and see if this would work.
Has anyone tried geothermal to cool thier pool? I have access to a ditchwitch to dig 8 or so feet down where the ground temp is in the 60's. So what we were thinking is getting 100' coil of 1 1/2" poly pipe, dig a ditch 8' deep by 20' -25' or so long and expanding the coil in there and then filling it back in. Then use a jandy valve as a bypass, in one position water would come out of the pump and straight back into the pool, when cooling is not needed. In the other it would be diverted to go through the undergound coil for geo-cooling before returning to the pool. We figure cost for the coil and PVC and joints needed to compete this project would run around $250 maybe a little higher.
I know $250+ seams a little high for cooling considering I could get a fountain for a fraction of that but by doing it this way theres no increase in evaporation like with the fountain. Its easier to start cooling, once installed, no monkeying with the returns to hook up the fountain just rotate the jandy.
So is this just wishful thinking or are we on to something?