Quote Originally Posted by clavius View Post
A The ducts did not look all that dirty to me, so it was probably more effective at separating money from the homeowner than anything else.
Kind of like pest exterminators. Good ones will come in and rid your place of whatever the infestation is then tell you to call them if you have any more problems the rest want to put you on a regular pest control program and cash your monthly check. The bigger the name, the more they advertise to get more of yours and other people's money