Help! Unit, leaking in garage! Looked and looked, can't find help!

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  #1  
Old 07-10-13, 03:13 PM
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Help! Unit, leaking in garage! Looked and looked, can't find help!

Hi all,

I am in need of desperate help with a leak issue I am having at home. We have an AC unit outside, a furnace in the garage, and on the bottom of the furnace are more AC coils, that has a drain, it drains to a pipe that goes to the crawlspace to a larger drain. The drains are clear, inside of the AC unit, there is a tray to catch the condenstated water, the tray appears to be empty, as to show that the drain is working.

The issue I am having is that the outside of the AC unit in the garage is sweating horribly, puddling on the floor and causing issues. See pictures...what is causing this? What can I do to fix it? We use the AC, it works, we have had high humidity as we live in the midwest.


Water builds up on the outside bottom of the unit...







 
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Old 07-10-13, 03:17 PM
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For one thing that unit never should have been installed directly on a floor. A sure way to have it rust out and leak.
 
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Old 07-10-13, 03:23 PM
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This is common here in Indiana, the furnace blows under the house instead of through the attic.
 
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Old 07-10-13, 03:47 PM
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Pour water in the pan and see where it goes or doesn't go.Might be the lighting but pan looks nasty to me.
 
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Old 07-10-13, 05:16 PM
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It looks like the sheet metal plenum is not insulated and the cold air chilling the metal and condensation is forming on the outside.
 
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Old 07-10-13, 05:35 PM
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I agree with Pilot. The unit needs to be properly insulated.
 
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Old 07-11-13, 09:41 AM
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Insulation?

Thanks for the info, any particular insulation I need?
 
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Old 07-11-13, 10:43 AM
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There should be insulation inside of the sheet metal already.
 
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Old 07-11-13, 10:52 AM
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Ideally it should probably be on the inside with the dryer, conditioned air. At a retrofit I would glue rigid foam (extruded polystyrene) panels to the outside of the duct. Then tape the corner joints with aluminum tape. The foam will insulated and it does not absorb moisture so even if there is some condensation it will not harm the foam but with the foam board and taped joints hopefully the warm, moist garage air will not contact the cold duct and condense.

Below are pictures of the pink and blue brands foam board that I would try. There are other types & brands of rigid foam insulation that may work but watch out because some do absorb moisture.

 
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Old 07-11-13, 06:11 PM
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Right about the duct sweating,must be new to the home.
 
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Old 07-13-13, 10:12 PM
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Not new, cant see insulation

Hi all again,

Pilot Dane, awesome help, will get that, and insulate the outside, and I can't see insulation on the inside, and Guyold, system not new to the home.

Thanks all again, I'll try to post after pics!
 
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Old 07-14-13, 08:37 AM
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backyarddad, not saying the system but you yourself.
 
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