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Also, some people have found that the furnace duct into the belly of the beast is not connected very well at the furnace, sometimes not at all. I think that mine had one screw with some aluminum tape and was more disconnected than it was connected. I added some sheet metal screws to all of the ducting flanges that were attached to the furnace.
Pull the basement wall, and have a look at your furnace, just in case. Don't be too surprised at the rats nest of wiring that you will undoubtedly find behind the wall.
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