I manage and operate a motel in the desert where the oustide temperature reaches 110+ degrees on a regular basis in the summer. At night, the temp does not cool down sufficiently; its still hot. The main problem is I have a 40,000 gallon pool and it does not feel good enough for costomers when they jump in in throughout the day and night. I need some efficient way to cool the pool to reasonable temperatures so that the costomers will enjoy the pool. If you could please reply with some information on what you think could be a plausible solution, I would greatly appreciate it. If you happen to know what the expenses might happen to amount to, that would also be very helpful. Thank you for you time.