The employees from Airsmiths Home Performance redid my whole HVAC system, including the ductwork, furnace, and air conditioning unit. I had the company come out last year to look at the air conditioning unit. They did a good job, but the system was old. Ultimately, it had to be replaced. The staff was professional both times that I used them. I would recommend the company to other people based on my experiences with them. I have dealt with a lot of HVAC companies, but this one doesn't try to oversell you. The technician walked me through the process and did everything perfectly. I would be happy to use them again in the future.