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Old 12-04-2008, 12:02 PM   #16
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Condensation from Ceiling AC Vent


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I missed you dude.
I hope you mean that in a platonic way....

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Old 12-04-2008, 01:59 PM   #17
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JJeez now you make me all embarrassed for coming from a Hellenic
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Got ya!!!
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Old 04-05-2009, 10:37 PM   #18
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Condensation from Ceiling AC Vent


just wondering how this turns out. I have in floor heat so my A/C runs through our attic. We have flex tubes running down to the metal vents in the ceiling. the flex tube actually connects to a short one piece metal tube/vent which goes to the ceiling. This is the piece where the vent cover screws into. I have the condensation as well and have fought this for years. We ended up unscrewing the vent covers (we could reach), stuffing the vents with old towels and removing in the spring. I just can't imagine that this is what anyone would want to do. AND I can't even get to the vents at 15' up! so... last year, I army crawled through the attic and sprayed foam insulation around the vents. what a mess. not much luck there. I have had the attic inspected for more insulation, but I have plenty there. I did leave my ceiling fan on in the main room all winter to better circulate the air (towels still in the bedroom vents ) this did seem to help. I was wondering if maybe those metal vents (the end part after the insulated flex tube) could be replaced with plastic vents... do they even make these? so, I'm VERY curious as well... permanent fix is needed desperately.
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Old 04-06-2009, 07:00 AM   #19
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Condensation from Ceiling AC Vent


is the metal boot that the register mounts to insulated ?? I have seen plastic registers
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Old 04-06-2009, 07:10 AM   #20
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Condensation from Ceiling AC Vent


The problem is natural convection currents are taking warm humid air into your duct system. Which is cold. And condenses that moisture.

Insulating around the register boxes helps, but doesn't eliminate the problem.

Try closing your returns off.

Also. good chance you have excessive duct leakage. Have them sealed, and that will also minimize the effect.
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Old 04-06-2009, 07:49 AM   #21
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My entire attic has blown in insulation... although the insulation dude said I had enough, I still did the army man crawl through the attic and sprayed the foam insulation around the vent boots. I do, by the way, close the vent returns. I understand WHY it's happening. I just can't figure out a great way to get it to stop. I do think leaving the ceiling fan on this winter helped (not the electric bill though). I believe the small amount of warm air gets through the closed vents, hits the cold boot and there you have it... condensation. remember... these vent covers are 15' up. Oh... I did try the lame magnetic covers... they don't stick well.

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Old 08-07-2011, 05:29 PM   #22
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Condensation from Ceiling AC Vent


I have a similar problem, but my ceiling vents are in my first floor ceiling so I am unable to get to them without tearing the ceiling out. Do any of you have any suggestions of how to tackle this problem?

Brett
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Old 08-07-2011, 06:15 PM   #23
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Remove grille, and seal the cracks around the boot, then seal the grille to the ceiling.
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Old 08-07-2011, 09:29 PM   #24
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I think I've solved my own problem. I believe the condensation was due to too much humidity...I shut down the humidifier and I no longer have the problem... I had to Kilz the brown stains around the vents and paint the ceilings
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Old 12-08-2013, 08:07 PM   #25
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Condensation from Ceiling AC Vent


I have a very similar problem with vent condensation:

I have baseboard, oil fired heat that I put on when it is very cold outside, and a separate A/C- Heat pump that I turn off when the oil is on...

I have ONE vent that gets condensation and rips, and have absoluetly no access to the attic above to insulate it better.

It only seems to drip when VERY cold out, or when it snows (it's not a leak--no issues when it rains out!)

The vent is at the very end of the run, and is the furthest point possible away from the main unit.

I have a humidifier that I run upstairs during the winter, which I think may be contributing.

Do you think running the fan on the A/C unit might help keep the air moving and stop the drip?
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Old 12-08-2013, 09:23 PM   #26
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Condensation from Ceiling AC Vent


Its the room air going into the vent and cooling down that is causing the condensation. Just block off the vent.
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Old 12-10-2013, 09:03 PM   #27
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Condensation from Ceiling AC Vent


My A/C guy did say I could run the A/C fan to circulate, but thought I'd just be cooling my house as air moved through the Attic venting. And I'd have to be careful to "catch" it in time.

After my last post, I am now blocking the air flow. The magnetic flexible sheets available at some hardware stores DO NOT work as they don't stick well and don't really "close" the air duct.

I now take the time (every fall) to unscrew the problem vents (only 3 have ever had problems…end of run) and stuff a towel in the duct. And screw the cover back on. It is a pain, but it works.
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Old 12-15-2013, 10:54 AM   #28
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I have turned on the "circulator" fan, whihc runs at about 40% of the regular fan...

No more condensation drips now (for a week), and the house "feels" warmer (my humidifier is upstairs, not far from the A/C return...I think the circulator fan is moving the humidified air around the house much better now...
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Old 12-15-2013, 10:57 AM   #29
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Condensation from Ceiling AC Vent


Might want to check inside the air handler to see if there is any condensation in it.
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Old 12-15-2013, 11:02 AM   #30
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Might want to check inside the air handler to see if there is any condensation in it.
Thanks--hadn't thought of that...

The drip pan is bone dry...

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