By far the biggest challenge to me is developing control of a well designed hydronic radiant system. So many variable ways to use hydronic, hi-temp/low-temp, hi-mass/low-mass, on-demand heat/storage, and combinations thereof. Can't see one control method fitting every situation so customizing seems to be the goal. And some may be as low tech as some fresh air. Or just putting on a sweater for awhile till floor catches up. Constant comfort is a hard thing to provide efficiently as possible in a variable world.
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