Parked Car Temperature Management

Using existing electronics in new car, or a plug-in box to control electronics of a car, keep a set temperature.

Crack windows
Crack sunroof
Turn on ventilation
Check web for weather forecast and close windows tighter if rain is predicted
Close windows completely if windshield wipers sense rain
Start car and turn on A/C or heater to achieve a temperature at a scheduled time (or when person sends text message to the car)

Start engine if battery is low.
Close everything and shut off devices if battery is low or fuel is low.