Be cautious with companies that offer “whole house air duct cleaning,” urges the NADCA. The company may be using unscrupulous tactics to upsell you once they get started. Before any work begins, always clarify in writing what the job entails and what the cost will be. To protect yourself against fraud, read customer reviews and verify that your HVAC cleaning service has applicable licenses and certifications.
Since your dryer has to blow exhaust air out through the ducts, the shorter the ductwork, the better. The total recommended length is normally less than 25 feet from the back of your dryer to the outside vent cover. If the duct has bends and turns, it should be an even shorter distance. The more turns, and the further the distance, the harder your dryer must work to move exhaust air and loose lint. A clogged dryer vent means:
"This a very professional company that came the next day after being contacted late in the day prior. The two guys that came to the door that did the work were well dressed and very courteous. They cleaned my diver vent and it works perfectly. I have their literature and will be calling them when I m ready for duct cleaning. Nice equipment too! Thanks for the good work. Nice not to have scroungy guys showing up at the door. "