Why Do My Ducts Sweat

Main causes for condensation occurring in your AC ducts include the temperature difference between the outside air and AC vent, improperly sealed AC ducts, and lack of insulation around these ducts. However, ductwork sweating can also be aggravated by factors like: Too much air moisture. Dirty air filters.

What causes sweating vents?

The cause of sweating vents is simple. Air that’s humid enough finds a surface cold enough. When vents start beading up with water—or worse, dripping—either the humidity is too high or the vent is too cold.

What does condensation on air vents mean?

Condensation occurs when humid air meets up with the cold air ducts. … This happens with your air conditioner because when you have cold air and cold vents but hot air on the outside, condensation will form. Condensation can then drip down and cause moisture on ceilings and walls.