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I have a Bryant AC unit in my attic. The unit is in the middle of the attic with supply air trunks going to the right and left. The vents attached supply air trunks on the right throw nice cold air. In contrast, the vents attached to supply air trunks on the left throw forceful air but its not cold. I tried to adjust the air flow with levers on each side of the unit where the air ducts meet the unit but of course, it didn't change the temp. Is there any way to have it throw equally cold air to all the vents?
 

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I have a Bryant AC unit in my attic. The unit is in the middle of the attic with supply ducts going to the right and left. The vents attached supply ducts on the right throw nice cold air. In contrast, the vents attached to supply ducts on the left throw forceful air but its not cold. I tried to adjust the air flow with levers on each side of the unit where the air ducts meet the unit but of course, it didn't change the temp. Is there any way to have it throw equally cold air to all the vents?

I'd have to think that you've got bigger issues than that. The air throughout the plenum should be the same temp well before it hits the plenum, as soon as it crosses that evaporator coil. Either the refrigerant is not boiling over until more or less halfway through the evaporator which would be a sign of system overcharge or the coil is blocked on one side or possible even both. It could also be that there's a restriction in the evaporator coil or in one or two circuits of it. Either way, the refrigerant is not evenly picking up heat at that point, in the evap coil.

I'd highly recommend that this receive the attention of an hvac tech at your home.

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