With R45-50 walls my main concern will be controlling overheating, not under, most of the time. With a lag time measured in days, it will be hard to predict heat need days out even with a reset valve. MN winter temps can and do swing 30 above to 30 below and back. Fortunately I have a large 3 season space to bleed off extra heat if needed. The goal is to try to not over heat if possible. Large solar gain capacity will also add to the challenge. Luckily my wife would love it 90 inside in winter. I'm outside most of the time anyway,lol.
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