I did consider this, but for me the primary reason for a heater is to have a comfortable living space when getting ready for bed, getting up, reading etc. We have good gear, so once we are actually in our bags it is perfectly comfortable. When traveling more than a week or so, I get very tired of not having anywhere that is a comfortable temperature to just relax. This is especially true in the winter when you can spend 12+ hours inside waiting for the sun to come up.Have you considered a 12v mattress pad? A second battery to run it off of may be an option for you, depending on your travel style/charge capabilities.