App updated today and I noticed you can "long press" on the quick controls to customize which buttons appear. If that is not new, it is still very cool. Trying to decide between on (fan); start; and defrost car. Does anyone know what each of these does? I normally just press the fan/on button ten minutes before I hop in, and intend to keep that. Is on a better option? Assume defrost car is a winter thing, but is it better than the fan on? Guidance appreciated.