It's not a legitimate function because the car will beep at you if you walk away. Some aftermarket remote starts have this feature. However, in many states it

It's not a legitimate function because the car will beep at you if you walk away. Some aftermarket remote starts have this feature. However, in many states it's illegal to leave a car running unattended. Though one could argue in court the baby or dog could serve as the attendant. Having said that, leaving a baby or dog unattended, AC or not, is just stupid.