What is considered a significant sign that duct sealing is necessary during an energy audit?

During an energy audit, a significant indication that duct sealing is necessary is identified by pressure readings above 25 pascals. High pressure readings generally indicate that the duct system is under excessive pressure, which can result from leaks, poorly connected ducts, or insufficient sealing. When the pressure differential is greater than what the system was designed to handle, it suggests that conditioned air may be escaping through leaks, reducing the efficiency of the HVAC system and causing increased energy consumption.

Detecting high pressure readings is crucial because it reflects how well the ductwork is functioning and can guide the auditor to areas that may need improvement through sealing or repair. Duct issues not addressed can lead to uncomfortable temperatures in living spaces, poor indoor air quality, and higher utility costs.