This is all great info, at least for me. An Alpha is what I am watching to get a good buy on as I have some time. I don't plan to pour floor for another year, till I get addtn framed, roofed and enclosed. Second floor loop is minimal pex cost and will most likely to heated by future solar panel experimenting for fun. I will have two solar powered loft ceiling to first floor ducted fans to mix stratified air(I have one in existing cabin and it really makes a difference) it is off at night but by than I want heat to rise to sleeping area which it does.
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