I think you mean CO,Carbon Monoxide, not CO2, carbon dioxide. Carbon Monoxide is a very real concern when burning an unvented propane heater in a small space. I sure wouldn't do it. You could wind up not waking up,red and dead. For the record, there is a difference between a tent and an ice shanty and deer blind when you can open a window and you are awake than being zipped up in a tent asleep.
Last edited by Oldtimr; 07-24-2017 at 05:21 AM.