

This is not the whole story because not every heating day is equally cold. I have a high end cold climate heat pump in Colorado (which works great btw). I use about 1/3 of my total annual heating energy in January, despite heating for >6 months of the year. I’ll use 10% of my annual energy budget for a long weekend if its -10F, and that’s all heat pump (I don’t even have backup strip heat). It would be 20% if i was using electric resistnace for those 4 days. Electric resistance is really not great, so folks really should get the best heat pumps they can that cover the coldest normal days. It’s fine to install strips as a true backup but you’re going to have some very high bills and high carbon if you’re using it 20-30 days/year. If its hydro/nuclear power you’ll still come ahead on carbon but that’s not the case everywhere.
Temps should stay quite flat at net zero. Extreme weather will persist, but not get worse in theory.
https://www.carbonbrief.org/explainer-will-global-warming-stop-as-soon-as-net-zero-emissions-are-reached/