We just had a furnace installed at the stick house and the installer pointed out the same thing on our house ducts. The main plenum leaks out all the seams into the basement. He gave me some "goop" to seal the seams with a brush, and some hi-tech tape.
House too big - too many pipes! I think I'll do the Monty first and show Dory how to do it so she can do the house.
