[bach-on]

One more thing about the air conditioner concept. From what I read and heard, the university test house had a problem with microbes and other pests. Over time, these things would affect the water. So, you may need to have a way to drain or flush the system periodically.

Doubt this would be a big factor in overclocking, but you said something about building a house. Hate to see you in the hospital.

Finally, the unit I read about only used the ground/lake cooling to initially clean the water. Then it was sent to some electrical heat pump device to take the temp down and reduce the humidity. It wasn't to replace the heat pump, just reduce the amount of cooling it had to do.