Originally Posted By: dandersen
This post was automatically imported from our archived forum.
And yes, it’s mold!
1. Do air quality testing to determine that it is mold.
2. Or you can use a bleach based cleaner and remove it from the since surfaces before it spreads.
There is very little you can do to effectively correct this situation when you live in a location where you have extremely high humidity levels in the outdoor air. If you look on the psychometric chart, you'll notice that it only takes about a 15? drop in dry bulb temperature to reach the dew point temperature (where condensation forms) at 60% relative humidity(6? @80% Rh) . As a general rule (however one I do not agree with) home inspectors are looking for a 20? drop in supply/return air temperature. Even if the air conditioner were located within the conditioned space within the house, you will be condensing water. Even if you insulate, the insulation may condense.
If you increase the air flow through the air conditioning air handler, the temperature difference will drop and you may not reach the dew point temperature on the outside of the air handling unit. But, then you will be reporting on the Delta T drop.
This condition is primarily a housekeeping matter in my opinion. It's like cleaning your shower. When it grows you clean it off.