Haven't read all the posts. We installed several PEX floorcooling systems in Belgium.
You don't have to install moisture sensors in the slab, they will be useless. Condensation needs measurement of the ambient temperature and RH to use this as a dewpoint controller.
Dewpoint controllers are ready available on the market.
Practical: we don't go lower than 18°C for the floor because otherwise this will feel unpleasant.
We use 8 cm PU foam, than PE foil, tubes of 18 x 3 mm with tackers, 10 cm wide and 6 rows of 5 cm around outer walls.
You can place these tubes also in the walls as long as the walls are made of stone or concrete.
You will face +/- 20 to 30 W/m² cooling effect with radiant cooling.
Burry PE pipes ( we use the same 18 x 3) at a depth of +/- 1 m and fill it with a glycol/water mix. You install a PHE on the radiant heating and a pump on the burried captation net outside. You then will have free cooling.
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