I hired them to fix the insulation around the room above my garage. The room often got 10 degrees hotter or colder than the bedroom down the hall. They removed all the blown in insulation under the room (joists above garage), above the room, and in the knee wall space above the family room. They air sealed all those spaces, dense packed cellulose in joists above garage, and blew 12" of cellulose in attic and knee wall space. They sealed boxes around the recessed light cans and air sealed the entire space. The difference in comfort level in the space is amazing. The workers were nice and professional. The protected the entire work area and path to the door with plastic everywhere. I was very impressed with their knowledge and workmanship. The whole thing took about a day. They got to my house promptly at 8 and left about 3:30.