An interesting side note here:
Joe Lstriburek once used cellulose insulation as a desiccant. If my memory serves this was in Florida and he pumped air through the attic insulation (blown in cellulose) during the night, then during the day the heat from the attic dried out the cellulose. He air sealed the attic, then used a vapor open membrane at the ridge to vent the moisture out of the attic. He still needed mechanical dehumidification, and he (understandably) wasn't comfortable blowing air through the cellulose.
BSI-088: Venting Vapor | Building Science Corporation