Spoke with homeowners regarding the balancing issues. The master bedroom was getting too hot when the sensor was in another room on the 2nd floor and the other rooms would get too cold when the sensor was in the master bedroom. Controls are setup to work off of thermostat or sensor only and it is not set to averaging. They said averaging was not working for them. Reviewed ductwork and found dampers present on all 2nd floor branch runs. Some 1st floor runs had dampers but not all runs. Measured airflow to each supply register. Adjusted second floor dampers and cut back more in master bedroom but cut back entire second floor to move more air to first floor as first floor is 5 degf cooler than second floor and insulation was being added today. Measured airflows to each regiater again.