How long will single battery last with heater running?

philh wrote:
We may have our first opportunity to dry camp mid winter for one night. Do I stand a chance of surviving on a single deep cycle 12V battery, or should I just plan on buying my first i2000?

There's just not enough data here to answer. How many amp hours is the battery? How many amps does the furnace draw? What percentage of the time is the furnace running?

I have a small forced air unit which takes 3.5 amps when running. At night I set about 55-60 degrees trying to keep run time under 50% if battery charge is an issue. At least for me sleeping with plenty of covers isn't a hardship.

When I'm up is where I like the 70 degree temps. Sunny days can be quite cold and still be pretty warm inside with a little help from furnace. Extended cloudy cold days are the worst. No solar, lots of furnace. Good to have that generator then.