Duct testing is a process where professionals check on the integrity of the ductwork that makes up a home’s ventilation system. Ductwork can suffer from holes, gaps at connection points, and other air leaks that will cause them to lose the conditioned air moving through them. These leaks, according to the U.S. Department of Energy, can account for up to a 30% loss of heated and cooled air from the HVAC system. That’s a great deal of air that you pay to heat or cool from which you won’t receive any benefit. Duct testing will discover if your ducts are leaking and what work needs to be done to fix them.