Bedbugs are notoriously difficult to get rid of, as they often live and multiply for a while before detected. The service man rid two of three rooms the first treatment, and came back two more times free of charge to successfully rid the last room of bugs. Note: it does take cooperation by the home dweller to deal with mattresses and bed coverings, and with PCO’s spray the job was done. Took about a month to make sure new hatchlings were eradicated.