Is the house quite tight? WHen exhausting air, there has to be air coming in to provide makeup. Do you leave the doors open when finished, or close them? Is there carpeting on the floor and little gap? If I remember, there are internal controls on (at least some) Panasonic models that adjust the actual fan speed. Does yours have this? What is it actually set for? It may only be running at something like half speed. How long is the duct on the outlet? Is the damper opening, or could it be painted shut and can't move? Is it installed in the proper direction? If you're not running the a/c, and the relative humidity is way up there, it may not clear the condensation for a long time.