There is no specific season for evaporative duct cleaning. However, it is recommended to get it cleaned before you need to operate it. We advise you to switch on your duct systems a few days before the actual season and notice if it is working fine or not. If you face any trouble then you should have time to get it rectified before you need the system. For any kind of duct related assistance, we are here always to help you. Just give us a call!