I called the company phone number which was a number in Columbia, SC on a Friday evening. The owner answered, and he told me that they have an office in my area of Greenville, SC. He was extremely nice and helpful. Very knowledgable. He said that he would have a representative of BioTek call me. Within five minutes, I got a call from Bill K, in BioTek's Mauldin office. He was extremely professional and knowledgable. I was very concerned about the possibility of mold in our house's air vents, and I knew that we had mold under the house. Bill came by the next day (Saturday), and did an inspection of the entire house. He took air samples inside and out. He took pictures under the house, and he went pretty far back into the crawl space to inspect. Within a few days he had an estimate, and the result of the air samples. The house was fine, but there was mold under the house. They took out all of the old insulation and plastic under the house. Scrubbed the mold off, and put fans in to dry it out. Once the crawl space was dry, they sprayed the wood and sub-floor with an anti-mold type of covering, and then let that dry. I believe that they put on several coats. They came back later and put down some black, heavy duty plastic, and then installed new insulation. They also installed a humidity monitor which we keep in our kitchen to monitor the moisture content under the house. We did not install a dehumidifier as he wanted to wait and see if the humidity will stay below 60% without having to pay for the dehumidifier if it's not needed (which I greatly appreciated). The craw space looks good. I would highly recommend Bio Tek to anyone who suspects that they have a mold issue. They are honest, and will not recommend anything that is not needed. All of the Bio Tek individuals were professional and friendly. They were also always on time. The warranty is good for 30 years, and can be transferred if the house is ever sold. Overall, a great experience.