Is there such a thing? In preparation for building manifolds for my 6 horizontal ground loops (3/4”, parallel), I got to wondering if there’s any advantage/disadvantage to feeding the ‘head’ of one and the ‘tail’ of another, especially if it improves the physical layout of the valves. All 12 lines come up through three large cores in my slab, so forcing all the heads on one manifold and all the tails on the other is doable, but messy. Does it matter? In the same vein, if you have two slinkies sharing a trench, so that they’re separated vertically by a few feet of earth, would it be advantageous to plumb the two ‘out of phase’ to even out heat extraction/rejection over the full trench length?