Has anyone ever tried anything like this? Since this board has a lot on hot water heating systems, thought I'd check here. Looks like this group has come up with the inverse of the wood fired boiler heating water for heat storage, they are burying water for cold storage. Opinions? Seems like the perfect setup, one could have heated or cooled air depending on the season with a simple turn of a valve. You could even extend the cooling ability of the tank by pumping water through underground loops.