I am just beginning to design a sip home for my retirement home of about 1400 sg. ft on the main floor, it will also have a full size walkout basement and a 700sq ft loft. I am planning to have pax tubing in the floor of the basement but I am not sure if a staple up or baseboard radiators would work best in the main floor and loft. It will be located in central Mn. and with the sip construction it  hopefully wont be too hard to keep warm. I know I am going to put a air exchanger and ductwork in for central AC. Any ideas would be appreciated. Thanks Ken

I would at least trade up to panel radiators and attempt to size them for a water temperature that the slab would be happy with as well, to keep the overall system as simple as possible.

I have installed staple up in 3 new homes in the Seattle area with great results. Once you get the hang of the process it goes fairly quickly. I'd do it in a heartbeat to get rid of baseboards.