oa Navigating the Building Energy Efficiency Research Landscape: A Bibliometric Analysis and Literature Review (2003-2023)<br><br><br>

Research on building energy efficiency (BEE) has increased significantly over the last twenty years, creating a complex and fragmented landscape that complicates a thorough comprehension of the field's development and present condition. This study utilises a mixed-method approach that integrates bibliometric analysis and systematic literature review to investigate the BEE research environment from 2003 to 2023. We examined 1,458 papers from the Scopus database, concentrating on publication trends, collaborative networks, research themes, and emerging issues. Research on BEE has expanded significantly, exhibiting a compound annual growth rate of 15.3% in publications. China, the United States, and European nations are prominent contributors to BEE research. The emphasis of research has transitioned from individual building elements to comprehensive, systems-oriented methodologies. Artificial intelligence, the Internet of Things, and improved materials are crucial catalysts of contemporary advancements. Collaborations among academics, industry, and policymakers have increased, promoting more applied research. This paper presents the inaugural complete, longitudinal examination of the BEE research environment, elucidating its evolution, present condition, and prospective trajectories. We delineate research gaps and emerging trends, providing a framework for researchers, policymakers, and practitioners to progress in the domain of building energy efficiency.