Cordless Car Heater
I am camping in my SUV in northern CA. It's a bit cold at night and in the morning, and can stay warm with blankets and a sleeping bag, but, when I get up, and want to change clothes or just sit, it is really cold.
It's a 1999 Ford Explorer V6, and I am trying to find or make a device that would heat the interior without turning the engine on.
I've seen handwarmers on amazon and ebay, but I don't see anything that warms that much space without a plug and without CO2 emission.