They were excellent. The job took two days and 7 hours as the work was extensive. I was in the apartment the entire time so can verify how hard the men worked. I have a mold infection in my lungs and have been diagnosed with allergies to a few types of mold. I called Cool Air to clean my apartment ducts. They ran a camera up and showed me photos of water and bacteria, they recommended a treatment that was so thorough my building superintendent is calling them for another person.