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Yikes! He has gone to allot of trouble to make that system work!
I keep looking at our existing air to air system and thinking that it is already a great starting point that doesn't really even need to be hacked directly, but rather an efficient means to exchange ground source heat with the exterior unit is all that it would take to drastically improve efficiency overall. The exterior exchanger could even remain air to air by positioning a second ground source exchanger around it, using the surrounding air as both a medium for extraction and storage as well as transfer.
I doubt the efficiency would be as good as a strict GSHP, but it would probably split the difference between the two and allow a retrofit of existing equipment that would not compromise integrity or reliability in any way, allowing the ASHP to continue to function normally even if the ground source loop fails.
In other words, no messing with solder, refrigerant, or things that could potentially explode!
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