Duct leakage in forced-air systems has been recognized as a major source of energy waste in both new and existing homes. Research conducted by nationally recognized organizations including the Advanced Energy Corporation (AEC) and the Building Performance Institute (BPI) have shown that testing and sealing duct systems is one of the most cost-effective energy improvements available for residential buildings, usually on the order of a 20% annual saving.

Sealing or replacing ducts, in conjunction with proper sizing, can lead to dramatic improvements in indoor air quality and comfort, in addition to energy savings. Leakage in a duct system can draw air from the attic or crawlspace into the living area, particularly if some or all of the system is located outside the building envelope.

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