Its so typical that you pick one of the worst features of the boat to hinge
your claims
on. The aft cabin on the C&C 34XL is a cave with almost no ventilation. There
is a tiny
hatch

Ventilation can be improved. Both 36's I was aboard had dealt with this, adding
a second port in the cabin sole wall. With cabin door open, it's fine. Dockside
there's AC of course.

RB