If you are parked reasonably close to where you live, you can go to the car some time ahead of your departure and place a closed container of hot water inside the coupé. 20 - 25 liters normally work fine for temperatures a bit below freezing. The floor under the windscreen is probably the best position. The hotter the water and the more insulated the car is, the better effect it will have. There are good third party car covers if you want to do it properly.
lunarhighway 
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