As for control of the slab, I would just use a slab sensor in a neutral area to trigger the heat source. Don't worry about night setbacks or fancy controls. Have lots of pumpkin or apple pie for extra energy and sneak out the ice fishing hut with some beer (or kahlua and coffee).
That passivehous i am doing will be based on outdoor temp + a neutral area air temp overide due to all the window area.
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