Condensation In Attic Ductwork In Winter

But i notcied that the condensation only formed when the outside temps fell below about 20 degrees.

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. Because the average humidity level is 10 20 in phoenix. Over time condensation dripping from your ductwork onto attic insulation can cause it to compress which lowers its r value. Condensation problem in the ductwork in wintertime question i have a dedicated ductwork system with the air handler in unconditioned attic.

Think about it condensation on ductwork probably isn t a big problem in phoenix arizona but why. Without seeing your duct attic situation one can only speculate but ducts touching each other lying on or in insulation in our climate. 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. If the attic is foam sealed with no leakage to the outside that would work.

When the warm air rising from the first floor gets into the duct inlets a lot of condensation forms. However an attic in pensacola florida is likely to have a humidity level closer to 100 and the risk of condensation on ductwork would then go up quite a bit. Even though the ducts are insulated and my attic is over insulated the air and surfaces inside the ducts will get very cold if the hvac is left off. 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.