The control
The hearth of the matter is the control board .This is where all the Zones meet and are by # of Zones, matching with the thermostat . If the tech did all the wiring according to the zone # and Thermos , Them everything matches .
Question : is there any air leaking around from the installation of these zones? If not its seal with silver tape and probably inside with mastic .
Matt 7:12 The Golden Rule
"Do for others what you would like them to do for you. This summary of all is taught in the law and the prophets.