We sold our house and in the contract the new owners required us to clean the ductwork because of their daughters allergies, we had been living there 5 years and had 3 cats. I had Daffy Ducts come out to clean the duct system. 3 weeks after the new homeowners moved in I got a call, their daughter had been in hospital because she had been sick since they had moved in. They had a indoor air quality test done and found out there was a mold problem in the duct work that had obviously not been cleaned properly. I ended up footing the bill for the tests and for the recleaning by a different duct cleaning company.