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Old 08-08-2011, 01:57 PM   #1
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One cold, one not, same plenum, no leak


2 duct branches from the same plenum give out different air tempurature. One gives out cold air, one is not.

Both airflow is equally sufficient (so there is no leak or blockage, or else it would give discrepancy in airflow). To confirmed, I have checked the trunk itself and found no air leak.


I am baffled, perplexed and beat.


Mike

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Old 08-08-2011, 02:21 PM   #2
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One cold, one not, same plenum, no leak


Has it always been doing this, has anyone been doing any work on this house, or playing around with the dampers for the duct work?

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Old 08-08-2011, 02:29 PM   #3
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One cold, one not, same plenum, no leak


Problem just this summer
No dampers are found along the trunks.
Seems the system only has registers on room ceiling
I just dont get it! if something worng with the unit, then all trunks from the same plenum would be equally effected
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Old 08-08-2011, 09:20 PM   #4
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One cold, one not, same plenum, no leak


What kind of ducting do you have? And how far apart are the vents.
Generally speaking, the vent closest to the unit will be the coldest. The furthest duct is the warmest. The duct system can pick up heat from the attic. Make sure everything is well insulated.
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Old 08-09-2011, 04:59 AM   #5
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One cold, one not, same plenum, no leak


If it just started this year. Check duct insulation first. If its ok. Then good chance the evap coil is dirty, and causing air stratification in the plenum.
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Old 08-09-2011, 10:15 AM   #6
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One cold, one not, same plenum, no leak


thanks everyone for your insight. I'm putting pieces of info together. How do I go about to clean a dirty evap coil ?
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Old 08-09-2011, 10:29 AM   #7
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One cold, one not, same plenum, no leak


can i do this myself or need to call a technician?
the unit is 20 years old. IS there a possibility for a new replacement? which will be costly
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Old 08-09-2011, 10:33 AM   #8
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One cold, one not, same plenum, no leak


Important thing to add:

the cool branch is gradually becoming warmer. I suspect its a matter of time before both branch stop giving cool air. Another word, the pproblem is spreading to the entire system.
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Old 08-09-2011, 10:35 AM   #9
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One cold, one not, same plenum, no leak


If you have access to the bottom of the a-coil you can do it. The best way to clean is removing the a-coil.

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