7/29/25 Tan & Joe Returned to diagnose insufficient cooling for second floor. This has been an on going issue since installation where first floor gets cold and second floor stays hot. Remote sensor for second floor kept dying shortly after changing batteries (1.5 week according to clients). System ceases to operate when remote sensor dies. They asked us to remove it and we did. We unassigned it from the system. We checked velocity and cfm at second floor registers and they were lower than normal. Upon checking basement system we found supply plenum was halfway detached from the supply trunk due to duct tape losing grip. Supply trunk is duct board. We reapplied tape and triple sealed it so it doesn’t come loose so easily. Also sealed gaps in between furnace and return drop at the return base. Changed filter supplied by customer. Rechecked velocity and cfm and it improved slightly. Also checked attic insulation and found no immediate issues. We checked configuration and changed minimum