CO₂ (R-744) refrigeration units use natural carbon dioxide as a refrigerant, offering zero ODP and a GWP of just 1. They operate in subcritical or transcritical cycles to deliver efficient cooling for both medium and low-temperature applications. With features like variable speed compressors, flash tanks, and hot gas defrost, these units achieve high energy efficiency, reduce piping costs, and support waste heat recovery. They are widely used in supermarkets, cold storage, food processing, and ice rinks, making them a sustainable, future-proof choice for modern refrigeration.