I don't have a 2720, but I do have a 2417. Last weekend it was 9° overnight, and we were quite comfy! I ran the heater in the evening (set at 68°), then all night with the thermostat set on 58°. No problem at all. Heater may have run half the time, but I saw no issues with it.
While many say the heater fan draws lots of power, I didn't notice any lack of power in the morning (that was our second night, and we were dry camping.) Water pump worked fine, lights were bright as usual (we got up an hour before sunrise). I was very impressed with how comfortable we were in that cold of weather!
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