What can improperly sealed ducts cause in a building?

Improperly sealed ducts can lead to significant energy loss within a building's heating and cooling systems. When ducts are not sealed correctly, conditioned air can escape into unoccupied spaces, such as attics or walls, instead of being delivered effectively to the intended areas. This causes the HVAC system to work harder to maintain the desired temperature, resulting in increased energy consumption and subsequently higher energy bills. While sealing ducts properly contributes to better air quality, enhanced indoor comfort, and reduced noise, these outcomes are not linked to improper sealing; in fact, they tend to be negatively impacted when ducts are poorly sealed.