I've recently moved into a house and noticed that one of the closets is unusually humid and has developed some mold and mildew on the shelves. This closet is the only area experiencing this problem, and I think it's due to a lack of air circulation. My initial thought was to trim the bottom of the closet door by about half an inch to help with airflow, especially since the carpet seems to trap moisture. I would love to hear any other home improvement suggestions to combat this issue, as I'd prefer not to rely on replacing a damprid bag every week.
2 Answers
First off, I’d suggest focusing on the carpet. Carpeting can often hide moisture or even mold issues from previous leaks. If your closet is near a bathroom or other water sources, it’s worth looking into how that might be affecting things. Removing the carpet can really help.
Check if your closet shares a wall with an exterior space. If it does, lack of insulation can lead to condensation and mold. When we had issues, we kept items away from those walls to let airflow in. It might help you too!

This closet is actually under the stairs with the laundry room right next to it, but we do live in a humid area, so I’m thinking moisture is definitely a big factor.