I haven't had my wolf pup in Zub-Zero temps camping, but have camped in about 20 degrees last winter with it. Held a good temp with just a small electric fan heater. I found if I use the propane to heat it up first, the small fan heater will keep it at a reasonable temperature.
How was condensation? Thats always been my issue, and I hate loosing the heat leaving a vent open.
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