4 ms·

So the basement is conditioned or not? Either way, residential AC duct looks like this: https://duckduckgo.com/?t=ffsb&q=ac+duct+r8+&ia=web https://duckduckgo.c

So the basement is conditioned or not? Either way, residential AC duct looks like this: https://duckduckgo.com/?t=ffsb&q=ac+duct+r8+&ia=web https://duckduckgo.com/?t=ffsb&q=ac+duct+r8+&ia=web This stuff is run through attics and the like all over the southern US where the attics are at ambient humidity levels, and I can't remember the last time I saw condensate forming on one that was properly sealed with mastic. In fact it would probably be a problem if it was because it would be dripping through the attics into the drywall ceilings. R8 doesn't sound like much, but its apparently enough to keep the outside of the duct from feeling cool at all.

toast0 4y ago
Basement is conditioned, and the air handler and the duct with condensation are in the conditioned space. Most of the duct work is out of sight so I can't say if it's got insulation, but right by the air handler, it's just sheet metal, no insulation. It's not properly designed, or built... but it's there. Mostly it works ok, just gotta have a separate dehumidifier near the air handler to keep things under control... fixing the zoning helped a bit too.