I currently live in the south so the incitianl answer is NO. But there is a change I might move up north with my job in the coming years and plan to keep the CRD for a long time. Do you know if you can add it aftermarket ?
Also can you remove the Cord when you are not using it ?
My diesel experience is with full size trucks and on those it helps it warm up a lot faster when parked outside, in an unheated garage, etc. Those are much larger engines and you can often be 20 minutes down the road in winter before before getting much heat out of the heater. Not sure how this plays out on these smaller engines but I'm guessing the warm up would still be at least somewhat quicker on cold mornings. Something you and your passengers will likely appreciate.