One of our customers had an attic that had old fiberglass insulation that had lost R-value due to settling. It also had evidence of critters using the attic for habitation, which in some cases can cause allergies for residents.
To solve this problem, we extracted the old insulation through our high powered vacuum. We then blew in new cellulose insulation that has a better R-value than fiberglass insulation. We also cleaned up the A/C units and the customer was very happy with the outcome of this project.