Approach to Duct Sealing
Making a home comfortable requires that two things occur (1) heat (or AC) is kept in the space through effective air sealing and insulation and (2) heat (or AC) is delivered to the space to make up for all losses. In most homes, heating and cooling are delivered to each room through ductwork. Ductwork is typically made of multiple sections of sheet metal, fiber board, or flexible plastic tubing which are mechanically fastened in the field. Each of the joints and seams where the ductwork is connected has gaps and cracks where hot furnace air or cool Air Conditioner air can leak out of when the HVAC unit is running. Up until the early 2000’s, this leakage was not looked at as significant, so nearly all duct systems installed before 2000 did not have any joints or seams sealed. They can leak between 20% to 40% of all air before reaching the farthest rooms from the HVAC equipment which has a major effect on the comfort of those rooms and the amount of time the HVAC system has to run.

In most homes, not all of the joints and the seams of the ductwork are accessible because the ductwork is installed in tight basement or attic spaces or hidden in the walls. Through AEROSEAL, all of the joints and seams can be sealed no matter where they are located because the sealing is done from inside the ductwork. In addition, the total leakage of the duct system is monitored the entire time the sealing is occurring so that the technician can verify and quantify how much sealing is being done. Typically, 80% of all air leaks in the duct system are sealed through AEROSEAL.

After the seal, more air flow can be felt at every register in the house and room temperatures are more even, less dust is pulled into the duct system and sent through the house, and the HVAC unit runs less to keep the house warm or cool.



An Atlas Energy Auditor can determine if your ductwork can be sealed with AEROSEAL to help you meet your goals of comfort and energy efficiency while minimizing investment costs and time.