I think he's identified the cause:
Quote:
Originally posted by Z-man
BTW: The reason for the higher humid levels is pretty easy to explain - two reasons: ONE: we do not have a fan in the bathroom, but that will shortly be resolved (once the electrician gets to our house!). and TWO: for the past year, we've kept the bedroom door closed to the rest of the house.
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We actually had the same battle last year. Shower & hottub off the master bedroom, with no bathroom fan. Got very little use with the previous owners, but it gets 2 showers a day with us, and we had mildew on ceiling & windows. Problem went away as soon as we put in a bathroom fan.
One suggestion: Where this is off your bedroom, get a top-end fan. We went through 3 before we found one that was quiet enough. Going by advertised "sones" alone is deceiving, some are higher pitched than others. In the end I went to my neighbor's house, asked if I could listen to his bathroom fan, then went out and bought the same one.