For those of you who have, or who have experienced travel in, an EV, something I'm curious about as to Canada (and colder parts of the USA like North Dakota) is how running the heater affects range. Certainly we know AC usage has a significant effect on EV range. I assume running the heater must have some effect but that it's likely less of an impact than the AC has, consistent with ICE-powered vehicles.
I suspect it will be worse than heat.
It definitely will be. As a general rule of thumb, heating consumes more energy than air conditioning for a very simple basic reason: temperature difference. To be comfortable, the average human will want it to be somewhere in the range of 70 degrees, give or take a few. For air conditioning, even if it's 110 degrees outside (it usually is not), that's a 40 degree difference in temperature you're fighting against. But now for heating, if it's a roughly equally extreme -30 degrees outside, you're fighting against a 100 degree temperature difference! Since the rate of heat flow through the wall of the car is faster the greater the difference in temperature is (basic thermodynamics), even maintaining a larger temperature differential once you have achieved it will consume more energy.
Now, there are other confounding factors here. For one, as we all know, the sun heats up cars, whose surface area has a lot of glass. This hurts you when you're trying to cool the car but helps you when you're trying to heat it (though it doesn't help you at night, when it will be the coldest).
On the other hand, air conditioning works by pumping heat energy out of the car, and it can reasonably be expected to move 3 or more units of heat for every unit of energy it consumes. While it is possible (to a point) to reverse this process for heating, cars generally do not come built with two-way heat pumps and your car will be relying on electric resistance for heat, which only produces 1 unit of heat for every unit of energy it consumes (any more would violate the laws of physics). So the heater, in addition to needing to provide more output, is considerably less efficient at doing so.
Another thing to consider here regarding range is that batteries themselves are temperature sensitive. When it is really cold outside you will get less range even if you don't run the heat, simply because cold temperatures lower the electric resistance in the battery and cause it to lose energy faster.
Sometimes I really envy those who don't know physics, not even at high school level. World must be really full of miracles and wonders to such lucky folks!
https://insideevs.com/news/515413/tesla-models-battery-pack-reduction/
Yeah, I don't know physics. Just relaying what I've been seeing, which is increased efficiency.
One thing I will say: Lithium Ion batteries as we know them are not the end of the road as far as battery technology is concerned. At some point, something else will become commercially available that is objectively better and Lithium batteries will become as quaint as Nickel-Cadmium batteries now are. What exactly that is, however, we can't be sure of yet. We also can't be sure whether it will happen before 2035.
Personally, I think it is more likely we will see a battery technology that can be safely charged up from near empty in 5-10 minutes than one which is just as slow but can go 1000 miles with the same mass/volume as current batteries. Reason I say this is because the former already exists experimentally, it's just not commercially available (yet?). The latter, meanwhile, would run up against the basic problem that if you squeeze more energy into a tighter space, the resulting battery is likely to be less stable/more vulnerable to having its stored energy released in an uncontrolled manner. And, of course, the more stored energy you have, the greater the damage that an uncontrolled release of it will do.