LeftieBiker wrote:The reason that even the Prime has lower efficiency than a residential unit is that EVs,unlike houses, have to be heated quite a lot in a matter of minutes - or even a single minute - while units heating houses can take a little longer without complaints. So EVs use their resistance heating units (which are a backup only with residential units, IIRC) to speed up heating the cabin. The resistance heaters then shut down after the cabin has gotten warm enough for the heat pump to maintain the set temp. That's why we call the system in the Leaf a "hybrid" heating system: both heating units work together, speeding heating but lowering efficiency.
A heat pump can work "faster," (meaning transfer more heat/time) but at reduced efficiency