Dear BOB, Great Show!!! This is my problem--I have a room with a 18 foot high cathedral ceiling on the south side of the house. The room is 20FT X 20FT and has a 3FT round window at the south peak. Frequently warm, moist air is trapped at the peak of the room causing water to condense upon the ceiling and to drip to the floor. Can you recommend a solution? I've been considering installing a permanent duty 300CFM exhaust fan at the north peak, or would natural venting be better. I would appreciate any help you may offer. Thanks, Bill.