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What's this?

That would make sense...the crawl space temp. is probably cooler than...

...the supply air temperature inside the ductwork once it gets far enough from the air handler, causing humidity in the supply air to condensate on the inside liner. Flex ductwork insulation doesn't have much of an R-value (it's probably R-6), so this seems plausible.

If that is what's going on, you'll need to figure out why the supply air is humid. Did the company that changed out your ductwork check the condition of the system? Was your refrigerant charge correct? Is the inside coil clean? If all of that checked out, then I'd suspect that your system may be sized too large for your house, which can cause it to "short cycle" - i.e. not run long enough to properly de-humidify the air inside your house. Does your home feel humid/clammy? Does the unit frequently turn on/off?

I may be totally off-base, but I think I'd start by investigating that stuff.

(In response to this post by MrBayAreaHokie)

Posted: 09/12/2019 at 4:11PM

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Current Thread:

Question for you HVAC experts -- MrBayAreaHokie 09/12/2019 3:48PM

He noticed a bulge..... ** -- turkeywinghokie 09/12/2019 4:19PM

Here you go. Read response #6 -- Stork 09/12/2019 4:19PM

Thank you Stork ** -- MrBayAreaHokie 09/12/2019 4:28PM

That probably makes more sense than my explanation... -- MP4VT2004 09/12/2019 4:25PM

I've dealt with engineer reports involving moisture in crawlspaces and I'm -- Stork 09/12/2019 4:27PM

Unless its a conditioned crawl space. -- HokieR 09/12/2019 6:29PM

Same here. I love mine.** -- 48zip 09/12/2019 8:43PM

Are you sure they're insulated flex ducts? Hot, humid crawlspace vs cold -- Stork 09/12/2019 4:11PM

Def insulated....i have seen the pink -- MrBayAreaHokie 09/12/2019 4:19PM

Is the duct insulated or the underside of the subfloor? ** -- Stork 09/12/2019 4:20PM

It's insulated duct. silver on the outside, pink on the inside ** -- MrBayAreaHokie 09/12/2019 4:23PM

Mouse pee most likely ** -- Brown Water 09/12/2019 4:00PM

To me it sounds like condensation NOT being pulled out of the air properly. -- MP4VT2004 09/12/2019 3:57PM

Yes, the crawl space is very cool...it's like an old castle, probably 50F ** -- MrBayAreaHokie 09/12/2019 4:04PM

That would make sense...the crawl space temp. is probably cooler than... -- MP4VT2004 09/12/2019 4:11PM

Rock on MP4..thank you ** -- MrBayAreaHokie 09/12/2019 4:20PM

You're welcome! Good luck...hopefully it's something simple. ** -- MP4VT2004 09/12/2019 4:22PM