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 January 19, 2016 at 7:08 pm No Comments Previous Post Next Post You may also like January 21, 2016 How do I know whether duct repair is required? January 25, 2016 After ducted heating or cooling cleaning, Is it possible to use the heater or cooling system straight after cleaning? January 22, 2016 Is duct cleaning a messy process?