[AC_Hacker]

Or how about this idea that can combine moisture removal with ventilation:

Build a dryer cabinet (located above the furnace) as was shown before in another posting, with vent holes to allow for some normal air circulation. Then make a good-sized vent in the floor in the floor of the dryer cabinet that would open to the furnace area below. If your furnace is dated and needs combustion air that is not supplied by a direct pipe to the furnace, when it fires up it would suck air through the drier cabinet, thereby getting rid of moisture and also making one last good use of the warm house air before it is sent out to the great heat sink in the sky.

This idea would particularly lend itself to enclosing the furnace inside it's own space.

-AC