Outside Tacoma WA I think it’s .089 cents, so it would cost us about $2.67 for my 100 mile commute, or about the same as 1/2 gallon of gas.
For an ICE to be less expensive it would need to either get over 200mpg or gas would need to cost about 62 cents per gallon if you had a 25mpg car.
Many now have a heat pump, similar to the AC but it can reverse the refrigerant flow and either cool the air coming in the car, expelling hot air by the radiator or heat the air coming into the car and blow cold air outside.
Older EV mostly had electric heaters, cheap and simply just like a plug in heater at home. But the can take 3-5 times more power.
Our Ioniq 5 mainly uses the heat pump, except for when running defrost then it uses both. Once the car has warmed up it can take just 0.8 - 1 kw to maintain the temperature. So with a 100% charge and 74kwh of battery capacity you can assume it would run over 70 hours.