This document discusses the potential role of residential heat pumps in future Danish energy systems based on energy system modeling. Residential heat pumps are found to supply 66-70% of individual heating demands after 2035, representing 24-28% of total heat demand. While Denmark's energy system can function without heat pumps, total system costs would increase by 16% and biomass use by 70%. Sensitivity analysis shows that parameters like heat pump performance and potential heat savings warrant further exploration to fully understand the impacts of residential heat pumps. The modeling highlights their potential to contribute flexibility and reduce excess renewable electricity production.