Condensation In Attic Ductwork In Winter

Because the average humidity level is 10 20 in phoenix.

Condensation in attic ductwork in winter.

When outside temperatures drop down below about 40 pretty much nov thru march condensation starts forming in the ducts and drips from some of the ceiling registers. If the attic is foam sealed with no leakage to the outside that would work. 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. But at a premium cost.

Over time condensation dripping from your ductwork onto attic insulation can cause it to compress which lowers its r value. Think about it condensation on ductwork probably isn t a big problem in phoenix arizona but why. The house air with its moisture rises into the ducts cools and condenses the moisture cool air sinks and is replaced with more warm moist air from inside the house. Another condensation problem occurs in cold climates in the winter with ac ducts in the attic and a different heating system.

Without seeing your duct attic situation one can only speculate but ducts touching each other lying on or in insulation in our climate. No the radiant barrier will not solve the condensation issue. But i notcied that the condensation only formed when the outside temps fell below about 20 degrees. Condensation problem in the ductwork in wintertime question i have a dedicated ductwork system with the air handler in unconditioned attic.