I live in the Chicago area, the temps. have dropped to the single digits over the last few days.It has been extremly cold! My home is a tri-level and I am experiencing condensation drips on the main floor. There is no snow or ice present on the roof. Most drips are near the outer walls on the ceiling and driping through the dining room light fixture. We do not have access to the attic of this part of the house. WHat is happening????