As gator said, RV heaters are not efficient. Then you get into what heater to use and then it gets into the fact that non vented heaters are not intended to be used while sleeping. You just opened the door to lots of reading and many opinions.
The vented heater that seems to be the best improvement is the "Cat platinum". Its vented, thermostatically controlled and not too bad on your battery (5 amps for 2 minutes each time it comes on and .7 amps for exhaust blower). Your solar setup would probably be able to keep you battery up easier with the amp draw of the cat than the RV heater.
The inexpensive way to go is a Buddy but then you get into venting, uneven temperatures, moisture, risk and an individuals susceptibility to even very small amounts of by products.
On top of all that is the issue of running the a/c. If you need a/c then you are a plug in or generator guy. Many who are big on solar are moving with the seasons and not running a/c. They are also getting by with buddy's or similar when they cant escape the cold.
I looked at it this way.
If I ever want a/c, hair dryer, microwave then I'm sticking with a genny
If I ever get to the point that I can do without those things completely, I'll go solar.
Maybe I would go some solar to help out but its a high price to pay and more weight for the benefit.
I'm NOT saying you can never run a micro or coffee heater with an inverter etc.
Ok ok I probably went on too far. :)sorry
