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I recommended getting the Nexus 7 rather than an ipad mini. For $199, you get more of the latest tech for less money than the mini. http://www.google.com/nexus/7/
Very difficult.
And this is coming from someone that writes apk's.
I cannot, however, speak on Apple OS. Just from a Android OS perspective.
Not to mention your iPad would have to be hardwired to the car's interface that controls the AC etc. Otherwise how else could you control it even if you had the app.