The colder the air is inside the duct the greater the chance of ductwork sweating.
Attic ductwork condensation.
You can convert your vented unconditioned attic into an unvented conditioned attic.
For more information on this.
There are two main ways to solve this problem.
Let s say your ductwork is in your attic.
It s a natural process and similar to the way a chilled soda begins to sweat once you take it out of the refrigerator on a hot day.
Condensation will begin to drip onto your attic insulation making it less effective at regulating temperatures inside your home.
It can also feed mold growth and cause ceiling joists to rot and sheetrock to disintegrate leading to unhealthy air quality in your home and the need for costly structural repairs.
Dripping condensation may also lead to a ceiling leak which not only looks bad but also rots drywall and can cause your ceiling to collapse over time.
First water dripping off of your ducts and onto your insulation can cause the insulation to compress which decreases it s r value or ability to insulate.
Ductwork located in an attic must be hung properly so that the insulation can do its job.
You can install insulation on the attic side of the register boot and you can make sure that your duct is adequately.
As the humidity level rises outdoors condensation will gradually begin to form on the surface of your air conditioning ducts.
When water condenses and drips into your attic or home it can cause a some serious secondary problems.
When ductwork is touching it forms a very cold spot where they are touching thus condensation begins.
Even though the air conditioning equipment appears to be operating normally humidity inside the house is between 60 and 65 and return ducts located in the attic show significant condensation.
Condensation on air ducts can be a serious problem.