Well, the liquid is definitely condensation.
The flue from attic up to roof is 6" diameter asbestos/concrete
product - difficult to remove.
So I want to explore my other options. I tried lowering the fan speed
on my furnace - thought was slower speed = hotter exhaust through
flue. No luck.
The other problem I have, which may also be a cause is my thermostat.
Its a new digital programable Honeywell, and it attempts to keep the
house at exactly the set temp, without deviating a single degree. As a
result the furnace short cycles. Heat goes on for maybe 5 minutes,
There are no settings on the thermostate to help out, so how to remedy
Ideally, if I set the temp to 68, I want the furnace to kick in at 66,
then shutoff at 69. Having that 3 degree gap, will allow the unit to
run long enough so there is no condensation. But how do you force a
thermostat to do that?