[sourcesmith]

The mechanical ventilation with heat recovery deals with the humidity problem.

[Tomte]

And introduces its own mold problem.

[sourcesmith]

For properly commissioned systems?

[Gibbon1]

What if I don't want to live in a plastic box?

[myspy]

Because we stood in front of the same decisions this year, I can only recommend to use wood not stone as building material. And wood fiber insulation. Building techniques in that area are pretty advanced. (At least I hope so, let's talk about it in twenty years again :D )

[sourcesmith]

What plastic box would that be?