The most likely explanation for the water in your ducts is that warm interior air is entering the ducts during the winter and the moisture in the air is condensing on the interior of the cold ductwork.
Water in heating ducts.
Water is in just about every soil to one degree or another.
If the problem has to do with water in the ducts then check your disclouser statements and check with a local attorney about what is required in the disclousre in your state.
The problem is happening because water often moves sideways through soil instead of straight down.
Long term condensation leads to various issues with your ac system.
If it is only in one vent you need to first eliminate the possibility of an interior source such as over watering a house plant a leaking aquarium or someone spilling water nearby.
Bad drainage around your house once the water finds its way under to even the smallest opening in the duct it will create a fissure and water will always find its way continuous rain gutter french drains etc will prevent this.
This can lead to air contamination and related health problems as in your home and can.
There are a few common reasons for water in air ducts.
Moisture can be a sign of low duct temperature.
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During the heating season unused air conditioning ducts located in unheated rooms can collect moisture.
Low duct temperatures can result in condensation which can accumulate during the winter months.
According to naima during the heating season unused air conditioning ducts located in unconditioned spaces can become saturated with water unless certain precautions are taken.
If you see water in any vent you should examine all of the other boots and ducts for water.
While the epa does not recommend frequent cleaning of air ducts a water leak is an exception because it poses health risks when the mold is carried into your house every time you run the furnace.
Martin holladay editor of green building advisor responds.
There are two possible ways to solve this problem.
Water in heating ducts tips water s in soil.
It can also form small water pools on the floor in severe cases.
Condensation or sweating is a common problem with air conditioner ducts.
Water that leaks into the air duct and stays there causes mold to breed.