my dealership put one when I bought my car and it's one of the asc ones, some of my friends got them put in too. I think asc ones are the best. You can mount the controls anywhere in the car like one of my friends had them mount the controls next to the steering wheel. It opens and closes on it's own when you turn of your car. Where do you live? Cause I know some people in the southern states say it's a waste of money because it's so hot they use their a/c all the time. But for the MN weather I always have it open when it's not raining, snowing or hailing.