Going on a call today. HO said the other company told her she needed an attic vent fan. The pan,from what I'm told,overflows at least once a week on humid days and trips the float switch. Have any of you guys heard of the attic being to humid and producing this situation? I haven't. Then the other company told her to pour bleach down the drain,put a dehumidifier in the attic. I'm going to check the drain line,told it was a long run. Double trapped maybe?