Right now a buddy and I are building a system that uses his AC system to heat the pool. It will be able to receive heat from both the upstairs and and downstairs units. The system uses propolene glycol in a closed circulating system (so he doesn't have to drain it in the winter). On demand, the control system will switch on the pump and bypass the fans on the evaporators. They will even make a determination to bypass the system if the air temp is cooler than the pool temp.

All of this will be inline, upstream of the traditional gas heater so the gas will serve as backup if needed. 400k BTU is alot!

The system is due to be in place spring of next year and I estimate it will cost about $1K to complete.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250