How efficient would the 4k-9k BTU Mr Buddy be in a 7x12 CT without insulation in Quartzite? I'll need a few days to get and install some polyiso on at least the ceiling when I get there but in the meantime will have to do without. I've got the small screw-on propane canisters and two full 20lb tanks so will be ok on gas for a little while. Also a 2000watt inverter gen and 1500watt oil filled space heater. Am I good for the cold nights? I might have to miss the RTR and get there around Feb 1 given loose ends here need tying so might be a bit warmer by then down there.