This may come as a shock - but duct tape was never meant to be used on ducts. It became popular in WWII as a tool to keep moisture from entering into ammunition cases. After that, duct tape became the end-all solution for all home repairs, especially duct work. Duct tape does not have a strong enough adhesive to keep ducts together and prevent air leaks from happening, as shown in this Salisbury, MD ductwork. Duct tape may work for a temporary fix lasting a week or two, but anything beyond that is no longer beneficial. Duct tape combined with flexible ducts that easily breakdown should be replaced as soon as possible. Dr. Energy Saver's certified inspectors will give you a free estimate of the cost to replace your flexible ducts with sturdy, sheet metal ones as well as the proper seals and insulation to keep them efficient. This can all be done in your free home energy checkup, so contact us today!