What does leaky ductwork mean?

Leaky ductwork means that there are gaps, cracks, unsealed slip joints, loose tape, or disconnected seams in your home's residential heating and cooling distribution network, allowing conditioned air to escape into unconditioned spaces like attics, crawlspaces, and wall cavities, or allowing unconditioned attic air to be sucked into the system. This structural flaw forces your HVAC system to pump extra air to compensate for the losses, leading to soaring monthly utility bills, excessive runtime, and uneven room temperatures where some bedrooms remain hot while others stay freezing. Furthermore, leaky return ducts pull unfiltered dust, insulation fibers, and mold spores directly into your airstream. You can troubleshoot high utility bills using a pressure test. You can verify leaky ductwork when diagnostic blower door testing confirms that total leakage exceeds standard building code thresholds.