I’ve only come across Aeroseal a few times in discussion, but those times were always referring to structures that were already tighter that 8.5 ACH50. Can Aeroseal reasonably be used to bring something like that down substantially or is there a ceiling to where Aerogel can be used?

You mentioned in a previous post (about the undersized minisplit…comments are closed on that one) that the attic had some spray foam, but you did more and it was open cell. Also you mentioned that there were two air handlers for your system. My questions: If you had started with the attic being vented would you have changed to invented with closed cell foam instead of open? 2nd question….how do 2 air handlers work with one compressor? Can that be done with a traditional unit (a non-variable speed compressor)?

Bill, air sealing a house reduces the need to dehumidify in a humid climate because you keep the humid air out. Then you mainly have to deal with the moisture generated indoors and what you bring in through ventilation. An ERV exchanges moisture between the exhaust and supply air streams, so it brings in less moisture than other ventilation methods. Once you’ve done those things, handling the remaining humidity is easily done with the air conditioner on days that are hot enough. That just leaves the days when the temperature is moderate and humidity high, which I wrote about last year in this article:

The Perfect Weather for a Dehumidifier

Jason, I think Aeroseal is a great product. There are more reasons for using it than the one you mentioned, though. I’ve heard of some contractors using it to save time for their workers who need to move on to the next job as quickly as possible. It also helps ensure they meet code requirements for duct leakage. And in existing home,s you can’t always reach all the ducts to seal them by hand.