Between 2024 and 2025, CATC completed a comprehensive HVAC automation upgrade across three Carnival Spirit-class ships. The project encompassed a full replacement of all PLCs, install a new ethernet network, all cabin controllers, and a number of frequency drives. It also included the integration of Halton MARVEL and Valmet systems, alongside a complete reengineering of the system to enable efficient demand-based flow control.
As a result, the vessels now operate with a fully integrated system covering both all cabins cabin and HVAC automation, delivering optimized comfort and significantly improved energy efficiency.