We have a 4 ton Carrier gas pack for our 1996 sq ft house. A 2 zone system was installed when the unit was installed in 2015. It has 2 thermostats and automatic dampers. We have only had great results. We are selling the home and the buyer's home inspector felt it was not working correctly because both thermostats control the unit (duh!). They are concerned the dampers are not working correctly. My question is if one zone is calling air, will some air flow still come out of the vents of the zone that is not calling air? We do not have a problem with temperature control and feel it is working well. I know that our unit is more than is needed for our ranch style home. I am pretty sure there is a bypass damper as well. Thoughts?