Wow i thought i just answered this one. Check the filter and be certain its clean then If it has a hose for a drain make certian that it is not kinked . if not just make certian that he unit is tiled to the ouside about 1 inch or so. also this is a small unit so close the doors to all unused rooms and check to be certain that the fresh air vent is closed . some times called outside air as well. Hope this helps let me know.
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