I got the coaxial HX installed on an 8000btu window unit. Tested with a small 1gpm pump and a 5 gallon bucket of water and it heated the bucket to 125F in no time.
Waiting for a socket fusing unit to arrive monday ($39 shipped on ebay. Search pipe welding, not socket fusion) and then can get some pipes dropped into ground. Two 90 feet deep holes are done and water comes up to within 15 feet of the surface in both holes. Hopefully this will be enough to let the 8000btu AC help out this summer and further testing. The holes will need grouted with something, but havent figured what i'll do there yet.
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