Condensation In Attic Ductwork In Winter

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.

Condensation in attic ductwork in winter.

Condensation problem in the ductwork in wintertime question i have a dedicated ductwork system with the air handler in unconditioned attic. No the radiant barrier will not solve the condensation issue. 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. 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.

Over time condensation dripping from your ductwork onto attic insulation can cause it to compress which lowers its r value. When the warm air rising from the first floor gets into the duct inlets a lot of condensation forms. 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. But at a premium cost.

Because the average humidity level is 10 20 in phoenix. If the attic is foam sealed with no leakage to the outside that would work. But i notcied that the condensation only formed when the outside temps fell below about 20 degrees. Think about it condensation on ductwork probably isn t a big problem in phoenix arizona but why.