The integration of Home Energy Management Systems (HEMS) into Taiwan's smart grid infrastructure has been a cornerstone in enhancing energy efficiency. However, uncertainties persisted regarding the extent to which HEMS could effectively bridge the energy efficiency gap. This study investigated HEMS' role as boundary objects, capable of transcending knowledge barriers within complex socio-technical systems. To address these concerns, a comprehensive methodology was employed, guided by a mixed-methods approach comprising a systematic literature review and an interview. The development of the evaluative framework drew insights from the understanding of complex systems and the concept of boundary objects, uncovering the intricate interplay of elements, relationships, and emergent patterns. This framework served to illuminate the nuanced dynamics underlying HEMS adoption, fostering meaning creation and collective efforts, ultimately paving the path for enhanced energy efficiency. The findings elucidated multifaceted interactions between technology, user behaviour, and knowledge boundaries, collectively shaping the potential for energy efficiency enhancement. By amalgamating theoretical insights with practical experiences, the study furnished a comprehensive comprehension of the potential role of HEMS in effectively bridging the energy efficiency gap within Taiwan's evolving smart grid landscape. This research bestowed valuable insights for enhancing energy efficiency and navigating the intricate terrains of energy management, echoing beyond the confines of Taiwan and resonating in the global pursuit of sustainable energy utilisation.