I was getting poor airflow to my 2 bedrooms on my top floor.
The heating/cooling blower is 2 stories down in the basement.
I sealed up every horizontal duct seam I could get to in my basement and it
really did help the airflow upstairs. I found I was losing alot of air in
the basement ducts before it even got moving along the way to all the
registers in the house.


Anyway,
should I seal all the returns as well?
Would this make my airflow even better?