I really want one of the webasto heaters. Some of them can even be integrated to the audi canbus. Then one can use the cars interface to set up on and off time for the webasto (3 times a day) so the car is pre heated.
Just a couple of minor problems. The car mostly lives in the garage which is at the basement. Completely enclosed space so not sure how the fumes will affect that space.
Secondly, those systems are fairly expensive
Since I live somewhere that has 4 seasons but is considered more hot than cold, I have my doubts if it will ever recover its cost.
I live on the 7th floor
I suppose I could dangle down an extension cable through the garbage shoot.