Leaky ducts?
Your duct system has numerous opportunities to be leaky. Studies have shown that an unsealed duct system leaks from 20-40% of the heated air that’s supposed to be getting to the rooms of your house. This is bad for your comfort and energy bill, but it could be worse for your health and safety; a leaky duct system can create pressure differences in your heating system that can draw in contaminants like dust, soil gasses or flue gasses. A well-designed, well-sealed duct system should be a fundamental part of your otherwise energy-efficient home. The duct system should be entirely hard-ducted and sealed at all joints and penetrations with brush-on, low-/non- toxic mastic, not duct tape.
