Brand new system that feeds 3 bedrooms, one downstairs and two upstairs. The system is hooked up to 2 electronic dampers for zoning. The downstairs gets good and cold, however there doesn’t seem to be enough air getting to the upstairs.
It’s quite a long run to the upstairs bedrooms, maybe as much as 50’. We don’t see to get the same pressure upstairs as we do downstairs.
From the picture below you can see the ducting and the connection quality. Clearly these connections should be taped, but from brief inspection they don’t feel like they’re leaking air. The returns also seem to lack much sucking power. To even feel the airflow I have to wet my hand and hold it up to the return.
Would a booster fan help? Anything else?
EDIT: I noticed that the airflow was worse than usual and noticed that the refrigerant line was frosted over both at the coils and at the condenser. So I clearly have multiple symptoms if not problems with this system. The HVAC company is installing a blower into the supply duct, hopefully with increased airflow it will solve the cooling issue and the freezing of the refrigerant line.