Originally Posted by Admin Just to clarify a little. The 12 volt heater boxes do NOT cool. They are not designed to cool. They are only designed to heat and are used to keep cooked food warm while you bring it from one place to another. Personally I do NOT recommend that you use a cooler/warmer for heating, especially on the road. First it takes forever to heat it up and second it tends to be a breeding ground for bacteria and being on the road, it is not quit as easy to make sure it gets cleaned properly ...