Climate control

Does everyones climate control switch on the a.c. if you set the temp to 15 or below? It was -5 outside the other day yet it needs a.c. to maintain a temp of +15 i cant understand that.
 
It uses the AC compressor in reverse, drawing in heat from outside air, as opposed to cooling the car.

There is still useable heat in the air (from a AC compressor point of view!) down to about -20C. Its normal, all cars with Climate will do it.
 
Another point to this, people think you can only use A/C in the summer when its warm, not true!
it can be used anytime even more so when its raining as the A/C takes the damp out of the air and clears your windows a lot quicker.