I woke up this morning and went downstairs after showering to find several wet spots on my first floor ceiling below the second floor bathrooms, with water dripping through. There were no leaks in the ceiling above the second floor. Last night was unusually cold (around 10 degrees) and the heat was running most of the night at a moderate temperature (68 degrees; the heat pump is on the roof). I called the contractor who renovated the house before I purchased it four months ago. When he cut into the ceiling, he was unable to find any leaks in the pipes above, even when the upstairs bath, shower, and sinks were left running for an hour.
The HVAC ducts run through the house between the first and second floors. I suspect condensation on the ducts and/or the pipes might be the problem, but the contractor is skeptical. Anyone out there have any ideas?
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