I found a product, known as the Breeze, for about $280 at Amazon. It replaces damp, musty air in a basement with fresh, dry air. It has made it possible for our family to use our basement! We had a dehumidifier running for many years. It cost about $35 per month to run, needed to have the tank emptied, and never changed the air in the basement. Family allergies and the terrible smell kept everyone out.
This appliance costs pennies to run, is very sturdy, made of vinyl, has a full variable speed fan control and a humidistat that turns it on and off based on the desired humidity level. You can barely hear the fan. It installs as a dryer is vented. At $350, it costs so much less than the competition (Humidex about $1,200) (EZ Breathe about $1,500) (Wave Ventilation about $1,700). It's a steal.