The contractor just finished blowing cellulose into the walls of my 1130 sq ft 1957 ranch with stucco exterior walls. They started with three guys but about an hour into the job, one left. They used what looked like a sharpened piece of 3/4″ EMT conduit to punch a hole in each stud bay and then blew in the cellulose with a nozzle that looked like a pipe nipple attached to a globe valve. They also carried an on/off switch to control the blower that was left in the truck. Before blowing, they probed the holes to make sure there weren’t hidden fire blocks in the walls (my house has quite a few). After blowing the cellulose, they poked a cork in each hole and covered it over with drywall patch. Less than 4 hours later, they were finished and gone. For the $1280 they charged, there was no way I would have wanted to do it myself. This is the S.F. Bay Area and everything associated with remodeling seems astronomically expensive. I would consider this a true bargain compared to what I have had to spend on painting, window installation, etc. This was done from the inside and the house was pretty much empty, which may have speeded up the process, but they said they charged about the same to do the job from the outside, even with stucco walls. I think the holes in the drywall can be covered up pretty completely, I am not sure that would be the case with patching the stucco from what I have seen, however.