We in Connecticut also have a moisture problem.  I use an insulation between
the inner cover and top cover.  It's absorb ant and collects the moisture that
the hive generates and holds it so that it does not fall back down on the
bees.  It also has a 3/4 inch slot in it so the bees can exit from the bee,
also for ventilation.
You can used something like ceiling panels cut down to fit.   Works like a
charm.
 
Norm