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Simply put, moist air from anything can build up condensate. If this moist air or vented furnace vapor is exposed to freezing temperatures, eventually it will form a build up. The temperature inside has to be greater than freezing air around it, or it will build up a frosty ice cube. Pay close attention to insulating heat exchange if the furnace is not ...


Sounds legit. As you decrease the temperature of air inside the chimney you decrease the flow rate out of it causing the mixing with cooler air to happen in the chimeny rather than out of it. It could be that this didn't happen in 2011 because of warmer outside air temperature, different humidity conditions, or that your exhaust was running hotter/faster ...

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