DABBEL is the AI-Autonomous Building Management System (AI-BMS). The next generation of BMS´s based on a new core, an AI model based predictive control able to self-adapt to every building by itself and replace the human brain of the Technical Facility Manager in charge of the HVAC and energy systems in commercial buildings. The DABBEL AI saves up to 40% of the HVAC energy consumption and CO₂ emissions in commercial buildings and is the 24/7 Digital Twin of the Technical Facility Manager.