Smell from vents in afternoon


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Old 07-12-20, 03:24 AM
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Smell from vents in afternoon

Starting on July 4, we have had very hot and humid days. Since then, weíve had a smell coming from our upstairs vents that begin in late afternoon and go through the evening-but it seems to only be on very sunny/hot days. We checked out the filter on the unit In the attic and itís fine. We had an AC inspection and cleaning. They came in the morning so they didnít smell it and it still restiveness after they cleaned. The unit itself is only a couple years old, but the house was built in 1974. We donít have this smell coming from the downstairs unitís vents, which is actually older. We moved in last year. Any ideas on what this could be, or any suggestions on next steps?
 
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Old 07-12-20, 11:46 AM
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Welcome to the forums.

An extremely hard problem to diagnose without being there.
Is this just a split A/C system or is it a heat pump system ?
 
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Old 07-12-20, 01:42 PM
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Do you have 2 AC systems, one for downstair, one for upstair ? or only one AC ? You also said downstair vent is older, is up stair vent/duct newly installed ? We'll need more details in order to help you.
 
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Old 07-12-20, 07:41 PM
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Thanks for your replies! We have two units. The one in the basement, which cools the basement/first floor is older but thereís no odor. The other unit, which cools the 2nd floor, is located in the attic. The vents to the bedrooms from that unit have the odor coming out in the afternoon/evening. Surprisingly, the two bathrooms on the same floor do not have the smell coming from those vents. Could it be an issue with the ductwork leading to those particular vents?
 
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Old 07-12-20, 08:01 PM
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Could it be an issue with the ductwork leading to those particular vents?
Very doubtful..... The supply is one common duct system coming from air handler. The air should be the same in all of them. For you to smell the problem in only a select few would mean many leaks which would not make sense.

Is this just a split A/C system or is it a heat pump system ?
???

 
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Old 07-13-20, 12:50 AM
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What kind of smell anyway ?
 
 

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