In theory if you can keep the demand of building less than supply of earth tube it should be feasible. Certainly would perform better than air to air heat pump not using pre tempered air. Not confident the multi tube layout would draw air fully balanced without some monitoring and flow control. Might draw most of its air thru least resistance tube(greatly lowering ground heat potential. One or two concentric square tube layout would lessen this greatly, IMO. Great way to isolate mold trouble.
Simple solar air collector/s at the intake of tube could supply even more heat when sun makes it available. I plan an 6x8' one for the intake of my earth tube(simple soda can design) which will also hold the intake filter.
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