AC, You say your incoming water temp is 40 degrees? Should not water from ground loop be in mid 50's? And you has said how cap tube should be right one for compressor, have you saved matching tube with each salvaged comp or can proper one gotten from other source? In your Beta design the ground loop water has a "holding tank"? In theory this tank could get it "heat" from solar source as well potentially?
I too am most interested in water to water for heating. What I have found from hydro install info is 7/8 pex is recommended for best under joist heating and needs higher temp than "in floor" so if you can do even your durarock install you should be better off. Was also told efficiency of 3/8 and 1/2 pex(just need closer 3/8, maybe more loops) is same if you are really limited on wieght/thickness. And as your mystery puddle shows I have learned hydro cooling is limited by condensation problems(why A/C's have drip pans I am told). On topic of your whole hydronic system if you haven't discovered it already explore "open systems" it is exactly the install for my needs. Even incorporates some cooling possibilities.
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