if you are using this primarily for cooling.. here is another thought.. Have done this myself.. connect a standing water tank (water heater) to a heat exchanger. have a small circulation pump to pump water to and from the tank use a thermal switch to turn the pump on only when energized by the ac. It is clean efficient. if your water tank is of sufficient size your ac will give you almost 100% water heating and drop your cost of running the ac by over 30%
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