The Application dimension of the Fourth Generation Low GWP Refrigerants market delineates demand across five principal end‑use categories: commercial refrigeration, industrial refrigeration, residential air‑conditioning, transportation cooling, and heat‑pump systems. Commercial refrigeration, encompassing supermarkets and food‑service equipment, commands the largest share due to stringent emissions regulations in retail chains, driving a shift from high‑GWP HFCs to low‑GWP alternatives. Industrial refrigeration, serving process cooling in chemicals, petrochemicals, and large‑scale food processing, follows closely, reflecting capital‑intensive retrofits and long equipment lifecycles that favor refrigerants with stable thermodynamic performance. Residential air‑conditioning contributes a moderate portion, where OEMs adopt low‑GWP blends to meet regional efficiency standards. Transportation cooling, primarily in refrigerated trucks and railcars, remains niche but is expanding as logistics firms prioritize carbon‑neutral supply chains. Finally, heat‑pump installations, especially in district‑heating networks, represent an emerging segment, leveraging the high‑efficiency characteristics of fourth‑generation refrigerants to achieve lower operating costs. This application‑centric taxonomy underpins the overall market size by allocating revenue streams proportionally to each sector’s adoption velocity.