While the cold weather impact is a thing, I also want to point out that it is blown WAY out of proportion. Here's some anecdotes based on my experience with a Rivian. It doesn't have a heat pump, but it supposedly isn't impacted by cold as much as Ford's or some other brands. So research each specific brand. But my statements below would still hold true in most other circumstances.
It has zero impact on my day-to-day driving where I'm maybe driving tens-of-miles at most. The car gets plugged in at the end of the day and I start each day with a 70% charge. I can't even notice the difference in range on these days.
My winter efficiency runs at 2mi/kWh. My summer efficiency runs at 2.25mi/kWh. This factors in the combination of cold weather, less efficient snow tires, and I generally make a higher percentage of low-mileage (less efficient) trips in the winter. This is an 11% efficiency drop on average, although individual trips obviously fall on either side of that range. I've seen numbers like 33% range loss for Ford's, but I expect this is an extreme extreme scenario, and not a day-to-day scenario.
For our December holiday road-trip, cold weather had literally zero impact on our driving plans. Our plan was to leave Denver around 8pm on a Thursday night. It was a late departure because of a kids event, and wanting to get to Los Angeles by Saturday. The plan was to just make it to Glenwood Springs that night (easily doable on a single charge, summer or winter). It was in the low 20's when we left, and ranged in the teens and single-digits while driving through the mountains. We ended up stopping to charge for 10-15 minutes in Silverthorne, just because the kids needed to use the bathroom. We stayed at a hotel in Glenwood Springs right across from a DCFC. I just plugged the car in while everyone was eating breakfast in the morning and nearly filled the battery to 100%. Whatever range impact the cold had was not noticeable in the context of our other plans.
We had a similar experience driving home through the mountains coming home. We were tired and grumpy because of a long day of driving. It was mostly single-digit temps through the mountains. We stopped at one charger to have a quick dinner in the western rockies. We were a little impatient, so we didn't get quite enough charge to get home. But we stopped and charged in Silverthorne again for a quick bathroom break, and that got us the rest of the way home. I didn't measure the cold impact, but it impacted our charging times by no more than a minute or two. Our other needs to stop for food and bathrooms were the bigger driver of stopping needs.
I just wouldn't worry too much about the practical impacts of cold unless you do a lot of long road trips in sub-zero temperatures.
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