Don't know how I missed this.

I have a "heat pump" setup to heat the pool. I am currently using 2 E-Tech 6000btu heat pumps to heat the pool. The heat pumps are meant to be hooked up to a hot water heater but I am using them on the pool. The units have their own small water circulation pump so I simply dropped a 1/2 inch intake line in the pool and a 1/2 return line and I am good to go. The big advantage is that I get 5000btu cooling per unit or 10,000 btu of cooling total (about 1 ton). I have these units hooked up to my furnace fan to circulate the cool air around the house. The two units will maintain the pools temp running flat out 24 hours a day and I use the central AC much less, a win-win situation. The units pull about 2.1 amps each at 240 vac. I am using about the same power as I did before installing them so I am guessing my central AC is running that much less, and instead of dumping the heat outside I am heating my pool with the excess heat. I haven't run the boiler on the pool in over 8 weeks now. Of course this setup won't help me in winter, but any time I have to cool this is the way to go.

I am seriously considering upgrading to a marine AC unit. They work very similar. They use water to get rid of the heat and blow out cold air. I am thinking of about a 16,000 BTU unit. Right now I can maintain the pool with 10,000 BTU but not the hot tub. This should allow me to only run off peak (cheaper electrical rates) and run the central AC even less and hopefully heat both the hot tub and pool with nothing but waste heat from the AC.

But yes, if you pool is outside in the sun you won't have much of a heat sink and wouldn’t make a lot of since, but since ours is inside, way underground and never gets sun and always need heating.

So check out "marine air conditioner" on ebay or any marine supply place. You just need to run a 1/2 to 3/4 inch line to and from the pool to where ever the unit is and somehow get the cooling in your house.