low air flow&humidity

[fat eddy]

Unfortunately if the unit is running a fifteen minute cycle it will point more to a problem in the duct design rather than some type of equipment problem. We have to go with the fact that the stat is on the middle floor and that is the only floor that the unit will listen to or care about the other floors can be considered slaves to the middle floor. If the system fails to condition the other floors satisfactorally, then you have a ducting issue which may or may not be as simple as balancing it out. More than likely you will need to have the ducting modified to bring the other floors to some type of balance with the middle floor.

[fat eddy]

I just caught the part about two 10" supplies this defies any air flow chart ever made for a normal residential static pressure ? unfortunately or maybe fortunately the centrifugal blower in your furnace will peak out on its curve without moving the sufficeint air. You should have noticed in the cooling season that your suction line may have froze. You have to find a way to get the proper trunk connected to this thing. Is this furnace a lot louder than the previous one ?

[rsmith46]

Originally posted by fat eddy
I just caught the part about two 10" supplies this defies any air flow chart ever made for a normal residential static pressure ? unfortunately or maybe fortunately the centrifugal blower in your furnace will peak out on its curve without moving the sufficeint air. You should have noticed in the cooling season that your suction line may have froze. You have to find a way to get the proper trunk connected to this thing. Is this furnace a lot louder than the previous one ?

He just had it put in so hasn't run in cooling, no old system - electric heat before.