Heating system return temperature effect on heat pump performanceMaivel, Mikk; Kurnitski, Jarek11th International Energy Agency Heat Pump Conference 2014 : 12-16 May 2014, Montréal (Québec), Canada2014 / p. 1-8 : ill Investigations of different control strategies for heat pump systems in a residential ZEB in the nordic climate [Online resource]Clauss, John; Sartori, Igor; Alonso, Maria Justo; Thalfeldt, Martin; Georges, Laurent12th IEA Heat Pump Conference : presentations, Wednesday, May 172017 / 0.1.3.3, 11 p. : ill https://hpc2017.org/wp-content/uploads/2017/06/o133.pdf