Sons house, 8,888' altitude in Crested Butte Colorado, zone 6.
I used over 10,000' of 1/2" & over 1,000' of 3/4" between boiler room & 6x manifold sets.
Sorry to say, only concrete slab was in garage, 4" of XPS under. I think this is the cheapest & best way to heat.
Rest of house, demanded by Son, the pex has to transfer heat to air & then to finished surfaces. Less efficient & must use much hotter water, because of this I used a modern cast iron high temperature boiler, Burnham ESC6
The 1/2" pex (4" OC) is suspended about 1-2" below subfloors with R30 Rock wool a couple inches below pex.
I Installed a couple thousand feet of 1/2" pex in interior walls wherever possible.
House has WAY too many large windows.
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