 I have had a problem with  a mold and mildew smell whenever I first put on the air conditioner. I have had it in to the dealer 4 times to be fixed. They even replaced the air conditioning unit. It's ok for a while -- but then it always comes back.  It's definitely a design flaw -- and cannot be fixed. They tried to tell me it's because of Florida heat & humidity -- but I shut them down with that.  No one else I know down here has that problem I'm convinced it is just a poor design problem.