What is the best Season for Duct Cleaning? Home » FAQs » What is the best Season for Duct Cleaning? There is no best Season for duct cleaning, if there is smell coming out of your duct or if not a good air flow. Then you probably need duct cleaning. January 19, 2016 No Comments Previous Post Next Post You may also like January 27, 2016 Can you clean cooking exhaust systems too? June 2, 2016 Is your duct cleaning company use antimicrobial chemicals? May 29, 2016 You Guys Service or Install Ducted Heating Unit?