If we camped all the time with hookups this would be a no-brainer and I'd just go with a 1500w ceramic heater. We camp at least half the time without. We're also in the future going to take an extended road trip so recoverable power is important too, when going with an electric option. So here are some alternatives I've got tossing around in my head. Please comment on any/all pros cons and add if you can. Have any of you without a furnace used any of these, and how was your experience?
1. Generator + 1500w heater
Pros: Would heat it up very quickly. Generator can also be used for other things.
Cons: You have turn the generator off/on. And this won't work at night or in the morning in most camp locations, too noisy. But would be a good option in the daytime to get rid of the cold inside if needed during extremely cold days.
2. Heated 12v mattress pad with timer
Pros: Low wattage, and you don't need to remember to bring it if you leave it on the bed.
Cons: Doesn't heat the whole cabin, just the bed
3. 200w Lasko Myheat with a Goal Zero Yeti 400.
Pros: This will run the heater approximately 2 hours on full charge. Can fit in cabin, generator runs silently, myheat very quiet as well.
Cons: For multiple nights, you'd have to have a source of power to charge the goal zero, but possibly generator solves this issue, as it will charge the unit in 5 hours. So then you'd have to listen to that for 5 hours. Also this small heater may only be effective down to the low 30's, but I've seen mention of people using this heater and seem to think it at least takes the chill off. A lot would depend on the thermostat setting.
4. Hot water bottles
Seems to work for some, as in this thread:
http://tinyyellowteardrop.blogspot.com/2013/01/how-do-you-stay-warm-in-teardrop-trailer.html
5. Small dc ceramic heater
http://www.ebay.com/itm/12-VOLT-CE...537?pt=LH_DefaultDomain_0&hash=item48612c77e1
would perhaps supplement the other options, don't think it would work by itself very well.
6. Mr. Heater
Pros: portable, doesn't require any power, just propane
Cons: They seem to advertise this as "indoor" compatible, I have difficulty in trusting that. It supposedly has an oxygen sensor which does auto shutoff, not sure I would bank my life on the quality of that little sensor. But might work in a pinch with windows open.
So all of the dc options above would be supplemented by a 120w solar panel. Plus failing that, there's always the tow vehicle which will charge the battery in ~1 hour.
So I'm currently leaning against the furnace but we've got a while to decide so I'm taking the time to see what if anything can be done without it.
What you all think? Any other options you've used?
Dave