re: Mold in closets, (high efficiency air conditioner related)

As others have said, insulation issue most likely.

We bought a house and the following summer we opened up one of the closets and it looked like a horror show. Mold on everything all the way down to the door handle.

In looking at it, previous owner had can light replaced in the closet. Most likely when they we’re getting ready to sell. Electrician failed to push insulation back over the light fixture/ opening in the drywall. We could see where it was pulled back for the repair once we were in the attic. We pushed the insulation back over the fixture and never had another issue with it in the last 3 years.

Hot air was being pulled from the attic through the fixture opening and then formed condensation when it hit the cooler air in the closet. Once we blocked the flow via insulation problem gone.