Finding the Leak in Your Air Duct

Air ducts are like the highways of the HVAC or heating, ventilating and air conditioning system of your home. They transport conditioned air throughout the house. They also bring in fresh air from outside and dispose of stale air inside of rooms. About 20% of the air being pushed through the air ducts is lost in a typical home due to leaks or poorly sealed connections. Leaky air ducts can result in significantly raising utility bills and potentially result in contaminating the indoor air quality. Therefore, it is very important to be able to find the leaks in your air ducts.

Prime Areas for Leaks

Check duct work that goes through the garage, crawlspaces or attics. Any duct that appears kinked may have a leak.


Look for dirt around the seals of insulated duct work. This means there is a leak at a duct joint under the insulation.


Check the joints where the air ducts meet the air conditioning and heating units. If there are openings, cracks, dirt or lint, there is a leak.

Once you find a leak, it is important to seal it yourself or have it sealed by a professional right away.