Happy Joe
Apprentice Geezer
Me neither but some devices with "oxygen sensors" will not function or will only function erratically at around 9000 feet elevation...this varies by individual device with little consistency even within a brand/model (have seen a few that functioned erratically at 6,000 feet , actually 6,187 ft.).Low oxygen sensor,.... Offhand, I dunno what oxygen percent the thing shuts off,.
I see much paranoia about CO and a bit about CO2; just educate yourself about the appropriate venting required (takes a small bit of googling) and use appropriate ventilation. Why live in fear?
Personally I am a fan of a good sleeping bag, appropriate ventilation and no heater (except, perhaps temporarily, to reduce the cold shock when entering and leaving the bag).
Enjoy!
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