I have to say, after using our 2015 leaf SV for one month in cold weather (20s/low 30s) I am super impressed with the heater. In fact, my wife and I feel the Leaf heater warms the car much faster than any other car we've owned. What's odd, is unlike an ICE heater that blows hard, this one seems to be a early noticeable breeze t best. But still, it works. And it's not just the seat heaters, we've had that feature on our cars for a long time. Not sure if performance will drop as temps reach 0° and bellow, but so far, I've been driving toasty warm. I think ICE should adopt the Leaf heating system.