Hi,

Before all the other stuff, could you tell us the fundamental stuff?
Whether you're trying to heat or cool at the time of the problem. And
your local climate.

Sure, I am in Oklahoma, and the biggest issue is cooling during the summer.
I usually shut the vent down to about 50% in the winter and it seems to run
more closely to the house temp during those months.

Thanks for the help, I appreciate it!

Alan