10067341D-Xpert: AI-Based Recommender System for Smart Energy SavingClosedCollaborative R&DInnovate UKHeating and cooling buildings accounted for 27% of total UK energy consumption in 2019, and due to the cost and limited impact of energy audits, adopting more efficient HVACs can be a challenge. D-Xpert is an innovative technology which markets a low cost, effective and privacy-safe occupancy monitoring system. D-xpert is an AI-based recommender system that automates the building data analysis and is easy to deploy and operate. In the first phase we aim to build a consortium of stakeholders to validate the development approach, standardise the benchmarking process, and develop a data-sharing approach to address any commercial, security and privacy concerns. The UK Climate Change Act of 2008 is seen as influential in creating the market opportunity.