I asked Paul for a quote ref cleaning the ducts in Mother in laws condo. Paul did an inspection and advised that I could easily clean them myself. His honestly and advice on how to clean them, saved MiL the cost of cleaning. He did not want payment for the inspection, so I tipped him and his staff.
I have used Paul's company twice to clean the ducts at my home.
They do an outstanding job and can be trusted to provide with honest advice.