They arrived about 10 mins early. The tech was kind and friendly, he instilled confidence and explained what he was doing and the costs beyond the Groupon . We paid an additional $308 above the Groupon because our condo has two main ducts and we got an antibacterial spray to kill mold, bacteria and viruses. He said it would have been $500 without the Groupon. My home feels much cleaner and I hope our allergies improve!