This time of year, we get daily calls for moisture in the crawlspace that is caused by sweating ducts. Unless you have a sealed crawlspace, you should expect sweaty ducts this time of year. Even a confluent vapor barrier may not help, If the sweating is throughout the crawlspace, you may need to try a sealed crawlspace or at least a semi-sealed with a dehumidifier.  However, if just the distribution box has condensation, we can insulate the box and reduce the condensation. RCS does not try and up-sell, we will find the best solution for you.