I think it depends on the cavity the exhaust pipe goes out of....

Think of that wall cavity, or floor cavity, as a thermal mass that might have changed temperatures very quickly. We did have a huge temperature swing down to sub-freezing. So, the first day of the cold temps, the cavity was very cold because of the cold air infiltrating like I said before. As the furnace ran for the first day, the temperature rose in that cavity as the pipe heated up throughout the day. Now that the cavity's temperature has become a bit more stable, the condensation stops.

In response to this post by Late 80s Hokie

Posted: 01/22/2019 at 2:29PM

Any theories on why my gas forced air furnace was leaking water? -- Late 80s Hokie 01/22/2019 12:54PM

You should see a GI doctor. Forced gas with leakage is never a good sign. ** -- HokieGator 01/22/2019 2:17PM

I think that's condensation, and the higher flow when the unit... -- MP4VT2004 01/22/2019 2:01PM

With no direct water source, it has to be from condensation. ** -- MikeVT85 01/22/2019 1:48PM

Would snow getting blown into exhaust and/or intake pipes do it? -- Late 80s Hokie 01/22/2019 1:54PM

I think the extreme cold had something to do with it. -- HokieSignGuy 01/22/2019 1:03PM

You and jman could be right, but here's why I think it's something else -- Late 80s Hokie 01/22/2019 1:08PM

I think it depends on the cavity the exhaust pipe goes out of.... -- HokieSignGuy 01/22/2019 2:29PM

Lower humidity? It does get lower as the temp decreases (no frost either) -- 48zip 01/22/2019 1:21PM

Is it a high efficiency furnace? Those are (or can be?) condensing type -- jmanatVT 01/22/2019 12:59PM

I think it depends on the cavity the exhaust pipe goes out of....

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