Using the ZERO BREEZE in a car or truck for short periods of time is ideal for use with the 12V battery. ZERO BREEZE allows you to use AC in situations like waiting in the carpool line, eating lunch, or grabbing a quick nap in your car during a work break. Of course, never leave your pet alone in a warm vehicle as this could lead to harm to your pet. For that reason, we do not recommend using the ZERO BREEZE for that purpose.