Ministry of Road Transport and Highways (MoRTH) has issued a notification dated 8th December 2023 mandating the installation of air-conditioning system in the cabins of motor vehicles belonging to categories N2 and N3, manufactured from 1st October 2025. The performance testing of the cabin fitted with air-conditioning system shall be as per IS 14618: 2022, as amended from time to time. As per the Notification any vehicle of N2 and N3 category, manufactured in the form of drive-away chassis, on or after the 1st October, 2025, the chassis manufacturer shall supply a type approved kit of air conditioning system as per IS 14618:2022 to facilitate the body builder in installing the kit.