From my observation the cleaning of the air ducts was done very well. When it came to sealing the air ducts I question the accuracy of the air leakage rate (CFM) reading, because of the dime size hole in the plastic tube connected to the AC unit. This hole would influence the CFM leakage rating when pressurized. The hole eventually sealed itself., as the ducts were being sealed. As far as the AEROSEAL making an improvement in my AC operation, I’m uncertain at this point. Technician did not do a final check of all vents wife found two vents still blocked, had to remind Tech. After Techs left, I later found one vent block under a chair in the living room. I’m hoping for the price paid it will make a difference in my system operation.