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I use that mr heater buddy heater in the back of my canopy.Early season,late season,8 degrees doesnt matter. It takes the chill off when dressing in the morning.It has o2 senser .Never had shut off on me for that yet,but thats why i use it.We only run it before bed sometimes and in the morning thou.Works great.
I use the big buddy version and it seams to shut off way too often (after 3-5min in a wall tent). I think it has a faulty sensor though.