Can Mold Grow in AC Ducts?

Last year, during the rainy season, I smelled a musty odour coming from the AC vents and ducts. I wasn’t sure whether can mold grow in AC ducts or not. So, I discussed the same with my AC technician. According to him, two conditions are needed for mould to grow in ductwork: moisture and warm temperatures. 

Can Mold Grow in AC Vents?

I learned that yes, a warm, humid atmosphere is what mould loves to grow in. Mould in air ducts can arise from a humid environment combined with inadequate ventilation, or from anything that collects moisture in the walls and produces condensation.

Why Does Mold Grow on AC Vent?

My AC technician told me about the HVAC issues that can eventually lead to the formation of mould:

• AC unit too large:

Mould development in air ducts is one of the issues that can arise from an AC unit that is too large for the available space. Larger units tend to cool small spaces too rapidly and shut off before the air has had a chance to get dehumidified, which might result in an excessive amount of moisture. So he told me that it is important to ensure that the AC unit should be of the right size for the available space.

• Very low temperature:

Mould may occasionally grow around the vents if your air conditioner is set to a very low temperature. The temperature differential between the warm air in the room and the cool air coming from the vents can lead to the condensation of moisture in the air on surfaces around and inside the vents. 

• Leak in Ducts:

A similar kind of issue may arise if there are leaks in ducts that allow warm air to enter. Due to the temperature differential between the warm air in the walls and the cold air in the ducts, moisture may condense on the ducts, providing the ideal growing habitat for mould. 

After getting the response on whether can mold grow in AC ducts or not, I hired AC servicing from NoBroker to remove mould more effectively and safely.

Read More: