We recently requested to have air duct cleaning. Charles employee Coop was very knowledgeable in cleaning, explained thoroughly how the procedure would be done & would be able to accomplish the job without involving us at all. Upon completion he explained exactly what he did & what to expect. Also gave advise on how to upgrade the system in purifying against alergies, etc. Because of Coop, it was a very easy atmosphere. Would absolutely recommend Charles & Coop in particular.