Heater in my camper.

We use both an oil-filled type of electric heater in the spring / fall when we have electricity AND a Mr. Heater Big Buddy plumbed into our propane line during our winter ski days. We use more than the recommended amount of fresh air opening in the winter BUT we do not sleep in the motor home, as we use it just during the days while skiing. I would not take the chance, but many do sleep with the Mr. Heaters on. It is just what you are comfortable with. The Mr. Heater keeps our 31.5 foot motor home very warm, even on cold days and evenings. We usually run it at med. or low.