Non-intrusive Diagnostics for Legacy Heat-Pump Performance Degradation. - Iakovos T. Michailidis; Georgios Vougiatzis; Aliki Stefanopoulou; Asimina Dimara; Christos D. Korkas; Stelios Krinidis; Elias B. Kosmatopoulos; Dimosthenis Ioannidis; Christos-Nikolaos Anagnostopoulos; Dimitrios Tzovaras (AIAI (Workshops), 2022)