You should be using an air flow meter.

An airflow instrument would be good of course, and the best way if you knew the CFM required for each outlet based on a detailed heat loss/heat gain.

Comfort balancing is often a term used for simple balancing of areas to equalize temps as best as possible.

Starting with all dampers and diffusers open, if cooling start closing down the areas that are cooler, or if heating the areas that are warmer. Do this a little at a time (days) to achieve the comfort in the different areas that you wish.

Of course you cannot restrict airflow too much otherwise you will cause havoc on your system and create inefficiency.

Thanks for your help, zl700. I realize an instrument would be ideal, along with a manual J calc.
Just curious, if I partially close the dampers in the small bathrooms, is it a correct assumption that the air that would have been going to the bathrooms will go to another room?

Also, when I do my temperature tests in the bedrooms should I have the doors closed or open?

Teddy

"Just curious, if I partially close the dampers in the small bathrooms, is it a correct assumption that the air that would have been going to the bathrooms will go to another room?"

Yes to a point. Total minimum CFM must be maintained though for proper performance, safety and efficiency of the system when shutting dampers. Not knowing your system, I'm not aware of how much capacity you have to deliver the air elsewhere.

"Also, when I do my temperature tests in the bedrooms should I have the doors closed or open?"

You would want to do it in the situation that is most often and when comfort is most desired, open or closed. Again, I'm not sure if you have proper returns, jumper grills or could benefit from trimming bottom of doors.

Thanks for your help. I currently have returns in every room except the bathrooms and kitchen. As far as having them sized right, that I am not sure. I do not plan on partially closing to many dampers. Thanks

Teddy