Your right, it's not rocket science however it's not grade school stuff either. I'm not a pro which is why I'm here, I am a pretty good all around tradesman with 12 years construction under my belt. The problem is that I do in fact have some of the downstairs registers closed but it is not really improving the situation. Unless my only solution is to close all registers for the floor I'm not on...lol
. I thought by decreasing the 1st floor airflow it would increase the 2nd ( thus balancing ) but maybe it's not that simple, maybe my only other choice is to install duct booster fans?