Leaky ductwork might reduce indoor air quality and create heated patches in your house, just like an old air conditioner. Insulated ducts may rip, separate, or even collapse, allowing conditioned air to escape rather than reach your HVAC system or cooled rooms.
An expert can check your ducts for leakage. Repairing your system is a smart alternative if it is a more recent model and your ductwork has a few small leaks.