We find it regularly: a flex duct crushed under attic storage, a run that disconnected from the boot years ago and has been dumping conditioned air into the crawlspace, insulation sleeve torn open, or interior liner so degraded that cleaning would just shed more material into the airstream. In those cases cleaning is the wrong service and we'll say so. Paying to clean a duct that's leaking 30% of its air into an attic is money spent on the wrong problem. We repair what's repairable and replace what isn't — properly sized, properly sealed, properly supported. In a lot of Atlanta homes this is the single biggest available improvement in comfort and energy cost.