But no but no
I recommend the floor heating on all your surfaces, especially because of the mezzanine
account 60â,¬ / m² delivered (insulation + tube + regulation)
We must add the hatch to achieve approx. 15â,¬ / m² and the production of hot water.
a floor heating allows 10% of saving of heating compared to a heating on the air (convectors, radiators ...)
you can feed it by
Insert with water changer
Solar panels
Pompe à chaleur
Boiler pulsating gas
It's up to you to choose according to your budgets one of these systems or a composition of 2 equipments
Do not design on insulation thicknesses
20cm mini ceiling
10 cm mini on the outside walls
does not neglect thermal bridges and linear losses (between walls and slab)
knowing that glass wool or rock is 30% less effective than polyurethane or molded or extruded polystyrene, and therefore requires an additional equivalent thickness
Now, it's up to you
Pascal
Do not forget the ventilation
45 / 135 m3 / h in the kitchen
30 m3 / h in WC
45 m3 / h in bathroom and shower
Canadian well or double flow type