We actually found the company from internet by many recommendations. Firstly, we contacted the owner of the company and got some information about the procedure how to do it, how long will it take...Then compared with other company, we chose this one, as their equipment is very professional and especially the owner explainer very detailed. After they have dound the job, we were very satisfied, every single place is dduct free. thThey also gave us a procedure how to properly mantain the house. I love this company. In next year, I will definitely go with them!