It is best to replace you existing zone/ damper motors during the system replacement. Increased airflow can create more static pressure within the flexible duct requiring the motor to work harder provide more torque to open or close, this will drastically shorten the lifespan of the operating zone/damper motor proving the most cost effective solution is to replace during the system replacement.
For a system that has been installed for many years generally the motors are run via a 240v power supply, the zone/damper motors we provide are 24v and are installed with easy to use 24v plug & play type. Less power consumption with 24v option. New damper barrels also have less buildup of dirt, dust over the year of operation providing improved indoor air quality.
Installation of a new zone/damper during the replacement works is much more cost effective when there is an accessible ceiling space when wiring, installation and testing can be completed without obstruction. The time taken and labour allowed during replacement is cheaper retro fitting an existing system.