that suck's. have they looked into going after the installers? what you are saying is the duct sealing worked, but you are not sure how well?I have not had the aeroseal done at my house, but my neighbor did. We both have the very same house, built a the same time. I suspect that like everything else in the hvac industry, the installer is the key.
I did watch the neighbors pre-sales inspection, the installation and the post testing. What I am about to say, is based only on my observations.
The initial leak testing was done with all registers in place. A plastic film was placed over the registers to seal them. I noticed that the sealing did not extend to the register/wall interface. The house is over 25 years old and I can tell you, from my home, that the original 1/4 inch open cell foam register/wall gaskets have all turned to dust and provide no sealing. As witnessed by the dust streaks on the neighbors walls around each register. Additionally, the drywall to duct interface at each register was originally done, again my opinion, by a beaver with bad teeth!!!. In my home and my neighbors home, the register flanges barely cover the gap between drywall and the ducts/nailing flange!!.
Prior to the installation of the aeroseal, all registers were removed and caulking/mastic applied to the drywall and duct interface by the aeroseal installer. The ducts (now without registers, were then re-sealed with tape and plastic on the inside of the ducts. Then the aeroseal product was installed.
After the aeroseal was installed, the ducts were rechecked for leakage, without the registers in place, but with the plastic and tape in the ducts. The amount of leakage, was way way down in comparison to the original test. I believe that the installer advised that the estimated duct leakage, after the installation of the aeroseal, was down to 5 percent. I do not recall exactly, what the original estimated leakage was, but I believe that it was around 30 percent. Once the registers were re-installed, no further testing was done.
The neighbor also, from this same company, at the same time, had new dual pane windows, a solar hot water system and a new set back thermostat installed.
Again, these are just my observations of one company and one installation.