Ok, so you have a staple up or free hanging setup. That's not going to work real well with the lower water temperature that a heat pump provides. With the high water temperature you're using now, natural convection and radiation do a lot. These 2 effects go away drastically when you lower the loop water temperature.
With a solid slab, running a low temperature heating loop makes sense because of all of the thermal mass. With a thin floor, the heater pipes have to maintain direct contact with the surface they're going to heat. With most underfloor setups, this means heat spreaders. There's not much thermal mass, either. Lots of details to consider before you commit to a big system change.
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