The cost of $5K for a chiller unit is for a small residential pool in the 5K-15K gallon range. The Villages pools would require a far larger unit costing in the $15K-$20K range to have any effect. In addition, instead of just paying to run a heater, The Villages would now be paying to run the chiller in the summer when the heater does not run today.
In addition, Villages pools use an LP gas heater - heat pumps are not designed for the volume of water in these large pools. If you have your own pool, and have a screened enclosure over the pool, you won't run into this issue nearly as much. The screen knocks out about 75% of the UV rays, and water doesn't get nearly as warm. My pool never goes above 88 degrees, even when it's 100 out. 88 feels nice and cool when it's 100 out!
As proof that screen really helps with sun, my wife's sisters came down from MI this spring - both were white as white (typically Northerners coming out of winter
). They spent nearly every day in the pool, and after 5 days started sitting outside the screen because they weren't tanning - LOL.