How about opening the door occasionally. With a battery powered system, the heat comes from the power/energy used to move the vehicle down the road. That means that you don’t go as far if you use the heater.
With a gasoline based vehicle, the heat is extra, a freebie. It costs nothing extra. Well, actually you try to get rid of it.
The heat is still a byproduct on electrical motors. But the primary means of heating the cab is by a Heat Pump.
That said, maintenance is practically zero on an EV. The motors are designed to last about a million miles, no oil changes, no filters, the only fluid you will add is windshield cleaner. Topping the batteries is about $20 and that’s good for ~300 miles. If you have solar roof, your house can charge your batteries. If you have a storm; your car can power your home.
Just a matter of time before you have your car drop you off at the airport, tell it to go home and go into the garage and then come and pick you up when you get back