Originally Posted by
beenthere
Ok./ Its not the smart panel.
If you don't have a bypass damper. The upstairs gets the full air flow when only its calling.
With a bypass. Some of the air would recirculate through the unit. And cause the system to run longer.
Are your supplies loud when only one zone calls.
You might want to try setting both stats to fan "on".
That will help to circulate some of the cooler air from the first floor to the second floor.
Might get you a bit longer off time. And longer on time.
Best, would be for the contractor to install the right sized unit.
10-4 on the by-pass
also, I wonder if hes on high or med-high...might be as simple as reducing the blower speed
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