It's called a "condensate pump". One of the reasons 90 percenters are so efficient, they condense the steam out of the exhaust gas, which puts more heat into the house.
In the summer, the AC drains humidity out of the air, which also needs to be pumped out.
On a typical condensing furnace, the PVC vent piping will slope slightly UPWARD toward the outside, so that the condensate in the vent will drain back thru the furnace condensate handling system. See page 14 of the installation instructions here for a typical system:
MUST slope upwards. A minimum of 1/4? per foot (6.4mm
per 304.8 mm) of run is required to properly return
condensate to the furnace drain system
*OOPS. You're right. I shouldn't respond to these things before coffee.
On Oct 18, 8:54=A0pm, "Jim" wrote: ..air basically feels clammy...bought a
50% doesn't feel clammy to me, but maybe it would to you. Condensation on a triple pane window sounds unlikely at 50% too.But "sitting at" makes me wonder if the humidistat is working.
Your furnace should be cycling. This early in the season it should be off longer than it is on.
Can you watch your humidistat and see what happens when the furnace comes on? Does the humidity raise or lower as the furnace runs? That should tell you something about what is going on.
In addition to all the other good advice and questions, do you have a gas oven/range? Been cooking/baking a lot? Normally no one pays attention to the warning that the exhaust fan should be on when cooking. Besides using up oxygen, it puts LOTS of moisture in the air.
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