Hi folks. I need to figure out a heating option that can be done with a car battery. We are still building and didn't get far enough for power this year. We can get to -20 at night during the winter months and I only need it to heat the roosting area which will be curtained to about a 10'x4' area and heated to about 40 degrees. I do have a converter that connects to a cigarette lighter to use household things while traveling. I thought about connecting a ceramic heat bulb this way but wonder if that would draw too much power out of the battery to be practical. I'd also include a small florescent bulb for light if I went this way. The battery would only be able to be charged with a generator so I would like to avoid having to charge it too often. I seem to remember seeing a plug in device that turns things on when the temperature gets below 32, I can't remember where I've seen that. Anyone khow? Any recommendations?