House Works: Musty carpets a summertime problem

Some home ownership challenges are easy to understand and others are mysterious. Summertime mustiness is one of the mysterious kind. I was reminded of this when I got a message from a puzzled man growing weary of battling mustiness rising from his carpet. “If I don’t run the dehumidifier all the time during hot weather”, he explained, “the carpet on the concrete main floor of our home smells strongly of mould. What can I do?”
The first step to solving any problem is