Green Circle Decarbonize Technology is a Hong Kong-based provider of energy-saving solutions for buildings, operating through its subsidiary Boca International. Founded in 1992, the company's core product is the "Ultra-High Efficiency Boca Hybrid Power Chiller Plant," an advanced central air conditioning system built around proprietary Phase Change Material (PCM) Thermal Energy Storage (TES) technology. The system works by storing cold energy during off-peak electricity periods and releasing it during peak periods, reducing electricity consumption by at least 40% and cutting electricity running costs by roughly 50–70% versus conventional central air conditioning systems. Customers are commercial building operators, institutions, and industrial facilities with large air conditioning loads, including Hong Kong International Airport's HAECO headquarters, City University of Hong Kong, and an IBM data center. Green Circle generates revenue through three models: Performance-Based Contracting (PBC), where Green Circle finances and installs the system and earns a share of the electricity savings over a multi-year contract; Sale and Purchase, where Green Circle sells its PCM panels and software directly to customers; and Build, Own, Transfer, where Green Circle builds and then sells the completed system. The PBC model generates long-term recurring revenue but requires significant upfront capital. Beyond HVAC, Green Circle is developing PCM applications in cold-chain logistics, data center liquid cooling, and domestic heating. The company sells directly in Hong Kong and is expanding internationally through agents in mainland China, Korea, Dubai, and Malaysia, and is seeking to list on NYSE American under the ticker "GCDT."