@notail, you should not hesitate to use 100% charge at all in the winter, because it really is the combination of high temperature and high SOC that...
Thermodynamically speaking, it is impossible for one resistive electric heater to be more efficient than another. They all have the same efficiency....
It is true that they can just order things to happen, but the provincial and local governments often don't follow orders from above, so things can be...